src/librustc_driver/driver.rs

   1 // Copyright 2012-2015 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;
  16 use rustc::metadata::creader::CrateReader;
  17 use rustc::middle::{stability, ty, reachable};
  18 use rustc::middle::dependency_format;
  19 use rustc::middle;
  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 use rustc_privacy;
  30 use super::Compilation;
  31
  32 use serialize::json;
  33
  34 use std::env;
  35 use std::ffi::OsString;
  36 use std::fs;
  37 use std::io::{self, Write};
  38 use std::path::{Path, PathBuf};
  39 use syntax::ast;
  40 use syntax::ast_map;
  41 use syntax::attr;
  42 use syntax::attr::AttrMetaMethods;
  43 use syntax::diagnostics;
  44 use syntax::parse;
  45 use syntax::parse::token;
  46 use syntax;
  47
  48 pub fn compile_input(sess: Session,
  49                      cfg: ast::CrateConfig,
  50                      input: &Input,
  51                      outdir: &Option<PathBuf>,
  52                      output: &Option<PathBuf>,
  53                      addl_plugins: Option<Vec<String>>,
  54                      control: CompileController) {
  55     macro_rules! controller_entry_point{($point: ident, $tsess: expr, $make_state: expr) => ({
  56         let state = $make_state;
  57         (control.$point.callback)(state);
  58
  59         $tsess.abort_if_errors();
  60         if control.$point.stop == Compilation::Stop {
  61             return;
  62         }
  63     })}
  64
  65     // We need nested scopes here, because the intermediate results can keep
  66     // large chunks of memory alive and we want to free them as soon as
  67     // possible to keep the peak memory usage low
  68     let (outputs, trans, sess) = {
  69         let (outputs, expanded_crate, id) = {
  70             let krate = phase_1_parse_input(&sess, cfg, input);
  71
  72             controller_entry_point!(after_parse,
  73                                     sess,
  74                                     CompileState::state_after_parse(input,
  75                                                                     &sess,
  76                                                                     outdir,
  77                                                                     &krate));
  78
  79             let outputs = build_output_filenames(input,
  80                                                  outdir,
  81                                                  output,
  82                                                  &krate.attrs,
  83                                                  &sess);
  84             let id = link::find_crate_name(Some(&sess),
  85                                            &krate.attrs,
  86                                            input);
  87             let expanded_crate
  88                 = match phase_2_configure_and_expand(&sess,
  89                                                      krate,
  90                                                      &id[..],
  91                                                      addl_plugins) {
  92                     None => return,
  93                     Some(k) => k
  94                 };
  95
  96             (outputs, expanded_crate, id)
  97         };
  98
  99         controller_entry_point!(after_expand,
 100                                 sess,
 101                                 CompileState::state_after_expand(input,
 102                                                                  &sess,
 103                                                                  outdir,
 104                                                                  &expanded_crate,
 105                                                                  &id[..]));
 106
 107         let mut forest = ast_map::Forest::new(expanded_crate);
 108         let arenas = ty::CtxtArenas::new();
 109         let ast_map = assign_node_ids_and_map(&sess, &mut forest);
 110
 111         write_out_deps(&sess, input, &outputs, &id[..]);
 112
 113         controller_entry_point!(after_write_deps,
 114                                 sess,
 115                                 CompileState::state_after_write_deps(input,
 116                                                                      &sess,
 117                                                                      outdir,
 118                                                                      &ast_map,
 119                                                                      &ast_map.krate(),
 120                                                                      &id[..]));
 121
 122         let analysis = phase_3_run_analysis_passes(sess,
 123                                                    ast_map,
 124                                                    &arenas,
 125                                                    id,
 126                                                    control.make_glob_map);
 127
 128         controller_entry_point!(after_analysis,
 129                                 analysis.ty_cx.sess,
 130                                 CompileState::state_after_analysis(input,
 131                                                                    &analysis.ty_cx.sess,
 132                                                                    outdir,
 133                                                                    analysis.ty_cx.map.krate(),
 134                                                                    &analysis,
 135                                                                    &analysis.ty_cx));
 136
 137         if log_enabled!(::log::INFO) {
 138             println!("Pre-trans");
 139             analysis.ty_cx.print_debug_stats();
 140         }
 141         let (tcx, trans) = phase_4_translate_to_llvm(analysis);
 142
 143         if log_enabled!(::log::INFO) {
 144             println!("Post-trans");
 145             tcx.print_debug_stats();
 146         }
 147
 148         // Discard interned strings as they are no longer required.
 149         token::get_ident_interner().clear();
 150
 151         (outputs, trans, tcx.sess)
 152     };
 153     phase_5_run_llvm_passes(&sess, &trans, &outputs);
 154
 155     controller_entry_point!(after_llvm,
 156                             sess,
 157                             CompileState::state_after_llvm(input,
 158                                                            &sess,
 159                                                            outdir,
 160                                                            &trans));
 161
 162     phase_6_link_output(&sess, &trans, &outputs);
 163 }
 164
 165 /// The name used for source code that doesn't originate in a file
 166 /// (e.g. source from stdin or a string)
 167 pub fn anon_src() -> String {
 168     "<anon>".to_string()
 169 }
 170
 171 pub fn source_name(input: &Input) -> String {
 172     match *input {
 173         // FIXME (#9639): This needs to handle non-utf8 paths
 174         Input::File(ref ifile) => ifile.to_str().unwrap().to_string(),
 175         Input::Str(_) => anon_src()
 176     }
 177 }
 178
 179 /// CompileController is used to customise compilation, it allows compilation to
 180 /// be stopped and/or to call arbitrary code at various points in compilation.
 181 /// It also allows for various flags to be set to influence what information gets
 182 /// collected during compilation.
 183 ///
 184 /// This is a somewhat higher level controller than a Session - the Session
 185 /// controls what happens in each phase, whereas the CompileController controls
 186 /// whether a phase is run at all and whether other code (from outside the
 187 /// the compiler) is run between phases.
 188 ///
 189 /// Note that if compilation is set to stop and a callback is provided for a
 190 /// given entry point, the callback is called before compilation is stopped.
 191 ///
 192 /// Expect more entry points to be added in the future.
 193 pub struct CompileController<'a> {
 194     pub after_parse: PhaseController<'a>,
 195     pub after_expand: PhaseController<'a>,
 196     pub after_write_deps: PhaseController<'a>,
 197     pub after_analysis: PhaseController<'a>,
 198     pub after_llvm: PhaseController<'a>,
 199
 200     pub make_glob_map: resolve::MakeGlobMap,
 201 }
 202
 203 impl<'a> CompileController<'a> {
 204     pub fn basic() -> CompileController<'a> {
 205         CompileController {
 206             after_parse: PhaseController::basic(),
 207             after_expand: PhaseController::basic(),
 208             after_write_deps:  PhaseController::basic(),
 209             after_analysis: PhaseController::basic(),
 210             after_llvm: PhaseController::basic(),
 211             make_glob_map: resolve::MakeGlobMap::No,
 212         }
 213     }
 214 }
 215
 216 pub struct PhaseController<'a> {
 217     pub stop: Compilation,
 218     pub callback: Box<Fn(CompileState) -> () + 'a>,
 219 }
 220
 221 impl<'a> PhaseController<'a> {
 222     pub fn basic() -> PhaseController<'a> {
 223         PhaseController {
 224             stop: Compilation::Continue,
 225             callback: box |_| {},
 226         }
 227     }
 228 }
 229
 230 /// State that is passed to a callback. What state is available depends on when
 231 /// during compilation the callback is made. See the various constructor methods
 232 /// (`state_*`) in the impl to see which data is provided for any given entry point.
 233 pub struct CompileState<'a, 'ast: 'a, 'tcx: 'a> {
 234     pub input: &'a Input,
 235     pub session: &'a Session,
 236     pub cfg: Option<&'a ast::CrateConfig>,
 237     pub krate: Option<&'a ast::Crate>,
 238     pub crate_name: Option<&'a str>,
 239     pub output_filenames: Option<&'a OutputFilenames>,
 240     pub out_dir: Option<&'a Path>,
 241     pub expanded_crate: Option<&'a ast::Crate>,
 242     pub ast_map: Option<&'a ast_map::Map<'ast>>,
 243     pub analysis: Option<&'a ty::CrateAnalysis<'tcx>>,
 244     pub tcx: Option<&'a ty::ctxt<'tcx>>,
 245     pub trans: Option<&'a trans::CrateTranslation>,
 246 }
 247
 248 impl<'a, 'ast, 'tcx> CompileState<'a, 'ast, 'tcx> {
 249     fn empty(input: &'a Input,
 250              session: &'a Session,
 251              out_dir: &'a Option<PathBuf>)
 252              -> CompileState<'a, 'ast, 'tcx> {
 253         CompileState {
 254             input: input,
 255             session: session,
 256             out_dir: out_dir.as_ref().map(|s| &**s),
 257             cfg: None,
 258             krate: None,
 259             crate_name: None,
 260             output_filenames: None,
 261             expanded_crate: None,
 262             ast_map: None,
 263             analysis: None,
 264             tcx: None,
 265             trans: None,
 266         }
 267     }
 268
 269     fn state_after_parse(input: &'a Input,
 270                          session: &'a Session,
 271                          out_dir: &'a Option<PathBuf>,
 272                          krate: &'a ast::Crate)
 273                          -> CompileState<'a, 'ast, 'tcx> {
 274         CompileState {
 275             krate: Some(krate),
 276             .. CompileState::empty(input, session, out_dir)
 277         }
 278     }
 279
 280     fn state_after_expand(input: &'a Input,
 281                           session: &'a Session,
 282                           out_dir: &'a Option<PathBuf>,
 283                           expanded_crate: &'a ast::Crate,
 284                           crate_name: &'a str)
 285                           -> CompileState<'a, 'ast, 'tcx> {
 286         CompileState {
 287             crate_name: Some(crate_name),
 288             expanded_crate: Some(expanded_crate),
 289             .. CompileState::empty(input, session, out_dir)
 290         }
 291     }
 292
 293     fn state_after_write_deps(input: &'a Input,
 294                               session: &'a Session,
 295                               out_dir: &'a Option<PathBuf>,
 296                               ast_map: &'a ast_map::Map<'ast>,
 297                               expanded_crate: &'a ast::Crate,
 298                               crate_name: &'a str)
 299                               -> CompileState<'a, 'ast, 'tcx> {
 300         CompileState {
 301             crate_name: Some(crate_name),
 302             ast_map: Some(ast_map),
 303             expanded_crate: Some(expanded_crate),
 304             .. CompileState::empty(input, session, out_dir)
 305         }
 306     }
 307
 308     fn state_after_analysis(input: &'a Input,
 309                             session: &'a Session,
 310                             out_dir: &'a Option<PathBuf>,
 311                             expanded_crate: &'a ast::Crate,
 312                             analysis: &'a ty::CrateAnalysis<'tcx>,
 313                             tcx: &'a ty::ctxt<'tcx>)
 314                             -> CompileState<'a, 'ast, 'tcx> {
 315         CompileState {
 316             analysis: Some(analysis),
 317             tcx: Some(tcx),
 318             expanded_crate: Some(expanded_crate),
 319             .. CompileState::empty(input, session, out_dir)
 320         }
 321     }
 322
 323
 324     fn state_after_llvm(input: &'a Input,
 325                         session: &'a Session,
 326                         out_dir: &'a Option<PathBuf>,
 327                         trans: &'a trans::CrateTranslation)
 328                         -> CompileState<'a, 'ast, 'tcx> {
 329         CompileState {
 330             trans: Some(trans),
 331             .. CompileState::empty(input, session, out_dir)
 332         }
 333     }
 334 }
 335
 336 pub fn phase_1_parse_input(sess: &Session, cfg: ast::CrateConfig, input: &Input)
 337     -> ast::Crate {
 338     // These may be left in an incoherent state after a previous compile.
 339     // `clear_tables` and `get_ident_interner().clear()` can be used to free
 340     // memory, but they do not restore the initial state.
 341     syntax::ext::mtwt::reset_tables();
 342     token::reset_ident_interner();
 343
 344     let krate = time(sess.time_passes(), "parsing", (), |_| {
 345         match *input {
 346             Input::File(ref file) => {
 347                 parse::parse_crate_from_file(&(*file), cfg.clone(), &sess.parse_sess)
 348             }
 349             Input::Str(ref src) => {
 350                 parse::parse_crate_from_source_str(anon_src().to_string(),
 351                                                    src.to_string(),
 352                                                    cfg.clone(),
 353                                                    &sess.parse_sess)
 354             }
 355         }
 356     });
 357
 358     if sess.opts.debugging_opts.ast_json_noexpand {
 359         println!("{}", json::as_json(&krate));
 360     }
 361
 362     if let Some(ref s) = sess.opts.show_span {
 363         syntax::show_span::run(sess.diagnostic(), s, &krate);
 364     }
 365
 366     krate
 367 }
 368
 369 // For continuing compilation after a parsed crate has been
 370 // modified
 371
 372 /// Run the "early phases" of the compiler: initial `cfg` processing,
 373 /// loading compiler plugins (including those from `addl_plugins`),
 374 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
 375 /// harness if one is to be provided and injection of a dependency on the
 376 /// standard library and prelude.
 377 ///
 378 /// Returns `None` if we're aborting after handling -W help.
 379 pub fn phase_2_configure_and_expand(sess: &Session,
 380                                     mut krate: ast::Crate,
 381                                     crate_name: &str,
 382                                     addl_plugins: Option<Vec<String>>)
 383                                     -> Option<ast::Crate> {
 384     let time_passes = sess.time_passes();
 385
 386     // strip before anything else because crate metadata may use #[cfg_attr]
 387     // and so macros can depend on configuration variables, such as
 388     //
 389     //   #[macro_use] #[cfg(foo)]
 390     //   mod bar { macro_rules! baz!(() => {{}}) }
 391     //
 392     // baz! should not use this definition unless foo is enabled.
 393
 394     krate = time(time_passes, "configuration 1", krate, |krate|
 395                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 396
 397     *sess.crate_types.borrow_mut() =
 398         collect_crate_types(sess, &krate.attrs);
 399     *sess.crate_metadata.borrow_mut() =
 400         collect_crate_metadata(sess, &krate.attrs);
 401
 402     time(time_passes, "recursion limit", (), |_| {
 403         middle::recursion_limit::update_recursion_limit(sess, &krate);
 404     });
 405
 406     time(time_passes, "gated macro checking", (), |_| {
 407         let features =
 408             syntax::feature_gate::check_crate_macros(sess.codemap(),
 409                                                      &sess.parse_sess.span_diagnostic,
 410                                                      &krate);
 411
 412         // these need to be set "early" so that expansion sees `quote` if enabled.
 413         *sess.features.borrow_mut() = features;
 414         sess.abort_if_errors();
 415     });
 416
 417
 418     krate = time(time_passes, "crate injection", krate, |krate|
 419                  syntax::std_inject::maybe_inject_crates_ref(krate,
 420                                                              sess.opts.alt_std_name.clone()));
 421
 422     let macros = time(time_passes, "macro loading", (), |_|
 423         metadata::macro_import::read_macro_defs(sess, &krate));
 424
 425     let mut addl_plugins = Some(addl_plugins);
 426     let registrars = time(time_passes, "plugin loading", (), |_|
 427         plugin::load::load_plugins(sess, &krate, addl_plugins.take().unwrap()));
 428
 429     let mut registry = Registry::new(sess, &krate);
 430
 431     time(time_passes, "plugin registration", registrars, |registrars| {
 432         if sess.features.borrow().rustc_diagnostic_macros {
 433             registry.register_macro("__diagnostic_used",
 434                 diagnostics::plugin::expand_diagnostic_used);
 435             registry.register_macro("__register_diagnostic",
 436                 diagnostics::plugin::expand_register_diagnostic);
 437             registry.register_macro("__build_diagnostic_array",
 438                 diagnostics::plugin::expand_build_diagnostic_array);
 439         }
 440
 441         for registrar in registrars {
 442             registry.args_hidden = Some(registrar.args);
 443             (registrar.fun)(&mut registry);
 444         }
 445     });
 446
 447     let Registry { syntax_exts, lint_passes, lint_groups, llvm_passes, .. } = registry;
 448
 449     {
 450         let mut ls = sess.lint_store.borrow_mut();
 451         for pass in lint_passes {
 452             ls.register_pass(Some(sess), true, pass);
 453         }
 454
 455         for (name, to) in lint_groups {
 456             ls.register_group(Some(sess), true, name, to);
 457         }
 458
 459         *sess.plugin_llvm_passes.borrow_mut() = llvm_passes;
 460     }
 461
 462     // Lint plugins are registered; now we can process command line flags.
 463     if sess.opts.describe_lints {
 464         super::describe_lints(&*sess.lint_store.borrow(), true);
 465         return None;
 466     }
 467     sess.lint_store.borrow_mut().process_command_line(sess);
 468
 469     // Abort if there are errors from lint processing or a plugin registrar.
 470     sess.abort_if_errors();
 471
 472     krate = time(time_passes, "expansion", (krate, macros, syntax_exts),
 473         |(krate, macros, syntax_exts)| {
 474             // Windows dlls do not have rpaths, so they don't know how to find their
 475             // dependencies. It's up to us to tell the system where to find all the
 476             // dependent dlls. Note that this uses cfg!(windows) as opposed to
 477             // targ_cfg because syntax extensions are always loaded for the host
 478             // compiler, not for the target.
 479             let mut _old_path = OsString::new();
 480             if cfg!(windows) {
 481                 _old_path = env::var_os("PATH").unwrap_or(_old_path);
 482                 let mut new_path = sess.host_filesearch(PathKind::All)
 483                                        .get_dylib_search_paths();
 484                 new_path.extend(env::split_paths(&_old_path));
 485                 env::set_var("PATH", &env::join_paths(new_path.iter()).unwrap());
 486             }
 487             let features = sess.features.borrow();
 488             let cfg = syntax::ext::expand::ExpansionConfig {
 489                 crate_name: crate_name.to_string(),
 490                 features: Some(&features),
 491                 recursion_limit: sess.recursion_limit.get(),
 492                 trace_mac: sess.opts.debugging_opts.trace_macros,
 493             };
 494             let ret = syntax::ext::expand::expand_crate(&sess.parse_sess,
 495                                               cfg,
 496                                               macros,
 497                                               syntax_exts,
 498                                               krate);
 499             if cfg!(windows) {
 500                 env::set_var("PATH", &_old_path);
 501             }
 502             ret
 503         }
 504     );
 505
 506     // Needs to go *after* expansion to be able to check the results
 507     // of macro expansion.  This runs before #[cfg] to try to catch as
 508     // much as possible (e.g. help the programmer avoid platform
 509     // specific differences)
 510     time(time_passes, "complete gated feature checking 1", (), |_| {
 511         let features =
 512             syntax::feature_gate::check_crate(sess.codemap(),
 513                                               &sess.parse_sess.span_diagnostic,
 514                                               &krate);
 515         *sess.features.borrow_mut() = features;
 516         sess.abort_if_errors();
 517     });
 518
 519     // JBC: make CFG processing part of expansion to avoid this problem:
 520
 521     // strip again, in case expansion added anything with a #[cfg].
 522     krate = time(time_passes, "configuration 2", krate, |krate|
 523                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 524
 525     krate = time(time_passes, "maybe building test harness", krate, |krate|
 526                  syntax::test::modify_for_testing(&sess.parse_sess,
 527                                                   &sess.opts.cfg,
 528                                                   krate,
 529                                                   sess.diagnostic()));
 530
 531     krate = time(time_passes, "prelude injection", krate, |krate|
 532                  syntax::std_inject::maybe_inject_prelude(krate));
 533
 534     time(time_passes, "checking that all macro invocations are gone", &krate, |krate|
 535          syntax::ext::expand::check_for_macros(&sess.parse_sess, krate));
 536
 537     // One final feature gating of the true AST that gets compiled
 538     // later, to make sure we've got everything (e.g. configuration
 539     // can insert new attributes via `cfg_attr`)
 540     time(time_passes, "complete gated feature checking 2", (), |_| {
 541         let features =
 542             syntax::feature_gate::check_crate(sess.codemap(),
 543                                               &sess.parse_sess.span_diagnostic,
 544                                               &krate);
 545         *sess.features.borrow_mut() = features;
 546         sess.abort_if_errors();
 547     });
 548
 549     Some(krate)
 550 }
 551
 552 pub fn assign_node_ids_and_map<'ast>(sess: &Session,
 553                                      forest: &'ast mut ast_map::Forest)
 554                                      -> ast_map::Map<'ast> {
 555     struct NodeIdAssigner<'a> {
 556         sess: &'a Session
 557     }
 558
 559     impl<'a> ast_map::FoldOps for NodeIdAssigner<'a> {
 560         fn new_id(&self, old_id: ast::NodeId) -> ast::NodeId {
 561             assert_eq!(old_id, ast::DUMMY_NODE_ID);
 562             self.sess.next_node_id()
 563         }
 564     }
 565
 566     let map = time(sess.time_passes(), "assigning node ids and indexing ast", forest, |forest|
 567                    ast_map::map_crate(forest, NodeIdAssigner { sess: sess }));
 568
 569     if sess.opts.debugging_opts.ast_json {
 570         println!("{}", json::as_json(map.krate()));
 571     }
 572
 573     map
 574 }
 575
 576 /// Run the resolution, typechecking, region checking and other
 577 /// miscellaneous analysis passes on the crate. Return various
 578 /// structures carrying the results of the analysis.
 579 pub fn phase_3_run_analysis_passes<'tcx>(sess: Session,
 580                                          ast_map: ast_map::Map<'tcx>,
 581                                          arenas: &'tcx ty::CtxtArenas<'tcx>,
 582                                          name: String,
 583                                          make_glob_map: resolve::MakeGlobMap)
 584                                          -> ty::CrateAnalysis<'tcx> {
 585     let time_passes = sess.time_passes();
 586     let krate = ast_map.krate();
 587
 588     time(time_passes, "external crate/lib resolution", (), |_|
 589          CrateReader::new(&sess).read_crates(krate));
 590
 591     let lang_items = time(time_passes, "language item collection", (), |_|
 592                           middle::lang_items::collect_language_items(krate, &sess));
 593
 594     let resolve::CrateMap {
 595         def_map,
 596         freevars,
 597         export_map,
 598         trait_map,
 599         external_exports,
 600         glob_map,
 601     } =
 602         time(time_passes, "resolution", (),
 603              |_| resolve::resolve_crate(&sess,
 604                                         &ast_map,
 605                                         &lang_items,
 606                                         krate,
 607                                         make_glob_map));
 608
 609     // Discard MTWT tables that aren't required past resolution.
 610     syntax::ext::mtwt::clear_tables();
 611
 612     let named_region_map = time(time_passes, "lifetime resolution", (),
 613                                 |_| middle::resolve_lifetime::krate(&sess, krate, &def_map));
 614
 615     time(time_passes, "looking for entry point", (),
 616          |_| middle::entry::find_entry_point(&sess, &ast_map));
 617
 618     sess.plugin_registrar_fn.set(
 619         time(time_passes, "looking for plugin registrar", (), |_|
 620             plugin::build::find_plugin_registrar(
 621                 sess.diagnostic(), krate)));
 622
 623     let region_map = time(time_passes, "region resolution", (), |_|
 624                           middle::region::resolve_crate(&sess, krate));
 625
 626     time(time_passes, "loop checking", (), |_|
 627          middle::check_loop::check_crate(&sess, krate));
 628
 629     time(time_passes, "static item recursion checking", (), |_|
 630          middle::check_static_recursion::check_crate(&sess, krate, &def_map, &ast_map));
 631
 632     let ty_cx = ty::mk_ctxt(sess,
 633                             arenas,
 634                             def_map,
 635                             named_region_map,
 636                             ast_map,
 637                             freevars,
 638                             region_map,
 639                             lang_items,
 640                             stability::Index::new(krate));
 641
 642     // passes are timed inside typeck
 643     typeck::check_crate(&ty_cx, trait_map);
 644
 645     time(time_passes, "const checking", (), |_|
 646          middle::check_const::check_crate(&ty_cx));
 647
 648     let (exported_items, public_items) =
 649             time(time_passes, "privacy checking", (), |_|
 650                  rustc_privacy::check_crate(&ty_cx, &export_map, external_exports));
 651
 652     // Do not move this check past lint
 653     time(time_passes, "stability index", (), |_|
 654          ty_cx.stability.borrow_mut().build(&ty_cx.sess, krate, &public_items));
 655
 656     time(time_passes, "intrinsic checking", (), |_|
 657          middle::intrinsicck::check_crate(&ty_cx));
 658
 659     time(time_passes, "effect checking", (), |_|
 660          middle::effect::check_crate(&ty_cx));
 661
 662     time(time_passes, "match checking", (), |_|
 663          middle::check_match::check_crate(&ty_cx));
 664
 665     time(time_passes, "liveness checking", (), |_|
 666          middle::liveness::check_crate(&ty_cx));
 667
 668     time(time_passes, "borrow checking", (), |_|
 669          borrowck::check_crate(&ty_cx));
 670
 671     time(time_passes, "rvalue checking", (), |_|
 672          middle::check_rvalues::check_crate(&ty_cx, krate));
 673
 674     // Avoid overwhelming user with errors if type checking failed.
 675     // I'm not sure how helpful this is, to be honest, but it avoids a
 676     // lot of annoying errors in the compile-fail tests (basically,
 677     // lint warnings and so on -- kindck used to do this abort, but
 678     // kindck is gone now). -nmatsakis
 679     ty_cx.sess.abort_if_errors();
 680
 681     let reachable_map =
 682         time(time_passes, "reachability checking", (), |_|
 683              reachable::find_reachable(&ty_cx, &exported_items));
 684
 685     time(time_passes, "death checking", (), |_| {
 686         middle::dead::check_crate(&ty_cx,
 687                                   &exported_items,
 688                                   &reachable_map)
 689     });
 690
 691     let ref lib_features_used =
 692         time(time_passes, "stability checking", (), |_|
 693              stability::check_unstable_api_usage(&ty_cx));
 694
 695     time(time_passes, "unused lib feature checking", (), |_|
 696          stability::check_unused_or_stable_features(
 697              &ty_cx.sess, lib_features_used));
 698
 699     time(time_passes, "lint checking", (), |_|
 700          lint::check_crate(&ty_cx, &exported_items));
 701
 702     // The above three passes generate errors w/o aborting
 703     ty_cx.sess.abort_if_errors();
 704
 705     ty::CrateAnalysis {
 706         export_map: export_map,
 707         ty_cx: ty_cx,
 708         exported_items: exported_items,
 709         public_items: public_items,
 710         reachable: reachable_map,
 711         name: name,
 712         glob_map: glob_map,
 713     }
 714 }
 715
 716 /// Run the translation phase to LLVM, after which the AST and analysis can
 717 /// be discarded.
 718 pub fn phase_4_translate_to_llvm<'tcx>(analysis: ty::CrateAnalysis<'tcx>)
 719                                        -> (ty::ctxt<'tcx>, trans::CrateTranslation) {
 720     let time_passes = analysis.ty_cx.sess.time_passes();
 721
 722     time(time_passes, "resolving dependency formats", (), |_|
 723          dependency_format::calculate(&analysis.ty_cx));
 724
 725     // Option dance to work around the lack of stack once closures.
 726     time(time_passes, "translation", analysis, |analysis|
 727          trans::trans_crate(analysis))
 728 }
 729
 730 /// Run LLVM itself, producing a bitcode file, assembly file or object file
 731 /// as a side effect.
 732 pub fn phase_5_run_llvm_passes(sess: &Session,
 733                                trans: &trans::CrateTranslation,
 734                                outputs: &OutputFilenames) {
 735     if sess.opts.cg.no_integrated_as {
 736         let output_type = config::OutputTypeAssembly;
 737
 738         time(sess.time_passes(), "LLVM passes", (), |_|
 739             write::run_passes(sess, trans, &[output_type], outputs));
 740
 741         write::run_assembler(sess, outputs);
 742
 743         // Remove assembly source, unless --save-temps was specified
 744         if !sess.opts.cg.save_temps {
 745             fs::remove_file(&outputs.temp_path(config::OutputTypeAssembly)).unwrap();
 746         }
 747     } else {
 748         time(sess.time_passes(), "LLVM passes", (), |_|
 749             write::run_passes(sess,
 750                               trans,
 751                               &sess.opts.output_types,
 752                               outputs));
 753     }
 754
 755     sess.abort_if_errors();
 756 }
 757
 758 /// Run the linker on any artifacts that resulted from the LLVM run.
 759 /// This should produce either a finished executable or library.
 760 pub fn phase_6_link_output(sess: &Session,
 761                            trans: &trans::CrateTranslation,
 762                            outputs: &OutputFilenames) {
 763     let old_path = env::var_os("PATH").unwrap_or(OsString::new());
 764     let mut new_path = sess.host_filesearch(PathKind::All).get_tools_search_paths();
 765     new_path.extend(env::split_paths(&old_path));
 766     env::set_var("PATH", &env::join_paths(new_path.iter()).unwrap());
 767
 768     time(sess.time_passes(), "linking", (), |_|
 769          link::link_binary(sess,
 770                            trans,
 771                            outputs,
 772                            &trans.link.crate_name));
 773
 774     env::set_var("PATH", &old_path);
 775 }
 776
 777 fn escape_dep_filename(filename: &str) -> String {
 778     // Apparently clang and gcc *only* escape spaces:
 779     // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
 780     filename.replace(" ", "\\ ")
 781 }
 782
 783 fn write_out_deps(sess: &Session,
 784                   input: &Input,
 785                   outputs: &OutputFilenames,
 786                   id: &str) {
 787
 788     let mut out_filenames = Vec::new();
 789     for output_type in &sess.opts.output_types {
 790         let file = outputs.path(*output_type);
 791         match *output_type {
 792             config::OutputTypeExe => {
 793                 for output in &*sess.crate_types.borrow() {
 794                     let p = link::filename_for_input(sess, *output,
 795                                                      id, &file);
 796                     out_filenames.push(p);
 797                 }
 798             }
 799             _ => { out_filenames.push(file); }
 800         }
 801     }
 802
 803     // Write out dependency rules to the dep-info file if requested with
 804     // --dep-info
 805     let deps_filename = match sess.opts.write_dependency_info {
 806         // Use filename from --dep-file argument if given
 807         (true, Some(ref filename)) => filename.clone(),
 808         // Use default filename: crate source filename with extension replaced
 809         // by ".d"
 810         (true, None) => match *input {
 811             Input::File(..) => outputs.with_extension("d"),
 812             Input::Str(..) => {
 813                 sess.warn("can not write --dep-info without a filename \
 814                            when compiling stdin.");
 815                 return
 816             },
 817         },
 818         _ => return,
 819     };
 820
 821     let result = (|| -> io::Result<()> {
 822         // Build a list of files used to compile the output and
 823         // write Makefile-compatible dependency rules
 824         let files: Vec<String> = sess.codemap().files.borrow()
 825                                    .iter()
 826                                    .filter(|fmap| fmap.is_real_file())
 827                                    .filter(|fmap| !fmap.is_imported())
 828                                    .map(|fmap| escape_dep_filename(&fmap.name))
 829                                    .collect();
 830         let mut file = try!(fs::File::create(&deps_filename));
 831         for path in &out_filenames {
 832             try!(write!(&mut file,
 833                         "{}: {}\n\n", path.display(), files.connect(" ")));
 834         }
 835         Ok(())
 836     })();
 837
 838     match result {
 839         Ok(()) => {}
 840         Err(e) => {
 841             sess.fatal(&format!("error writing dependencies to `{}`: {}",
 842                                deps_filename.display(), e));
 843         }
 844     }
 845 }
 846
 847 pub fn collect_crate_types(session: &Session,
 848                            attrs: &[ast::Attribute]) -> Vec<config::CrateType> {
 849     // Unconditionally collect crate types from attributes to make them used
 850     let attr_types: Vec<config::CrateType> = attrs.iter().filter_map(|a| {
 851         if a.check_name("crate_type") {
 852             match a.value_str() {
 853                 Some(ref n) if *n == "rlib" => {
 854                     Some(config::CrateTypeRlib)
 855                 }
 856                 Some(ref n) if *n == "dylib" => {
 857                     Some(config::CrateTypeDylib)
 858                 }
 859                 Some(ref n) if *n == "lib" => {
 860                     Some(config::default_lib_output())
 861                 }
 862                 Some(ref n) if *n == "staticlib" => {
 863                     Some(config::CrateTypeStaticlib)
 864                 }
 865                 Some(ref n) if *n == "bin" => Some(config::CrateTypeExecutable),
 866                 Some(_) => {
 867                     session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
 868                                      ast::CRATE_NODE_ID,
 869                                      a.span,
 870                                      "invalid `crate_type` \
 871                                       value".to_string());
 872                     None
 873                 }
 874                 _ => {
 875                     session.span_err(a.span, "`crate_type` requires a value");
 876                     session.note("for example: `#![crate_type=\"lib\"]`");
 877                     None
 878                 }
 879             }
 880         } else {
 881             None
 882         }
 883     }).collect();
 884
 885     // If we're generating a test executable, then ignore all other output
 886     // styles at all other locations
 887     if session.opts.test {
 888         return vec!(config::CrateTypeExecutable)
 889     }
 890
 891     // Only check command line flags if present. If no types are specified by
 892     // command line, then reuse the empty `base` Vec to hold the types that
 893     // will be found in crate attributes.
 894     let mut base = session.opts.crate_types.clone();
 895     if base.is_empty() {
 896         base.extend(attr_types.into_iter());
 897         if base.is_empty() {
 898             base.push(link::default_output_for_target(session));
 899         }
 900         base.sort();
 901         base.dedup();
 902     }
 903
 904     base.into_iter().filter(|crate_type| {
 905         let res = !link::invalid_output_for_target(session, *crate_type);
 906
 907         if !res {
 908             session.warn(&format!("dropping unsupported crate type `{}` \
 909                                    for target `{}`",
 910                                  *crate_type, session.opts.target_triple));
 911         }
 912
 913         res
 914     }).collect()
 915 }
 916
 917 pub fn collect_crate_metadata(session: &Session,
 918                               _attrs: &[ast::Attribute]) -> Vec<String> {
 919     session.opts.cg.metadata.clone()
 920 }
 921
 922 pub fn build_output_filenames(input: &Input,
 923                               odir: &Option<PathBuf>,
 924                               ofile: &Option<PathBuf>,
 925                               attrs: &[ast::Attribute],
 926                               sess: &Session)
 927                            -> OutputFilenames {
 928     match *ofile {
 929         None => {
 930             // "-" as input file will cause the parser to read from stdin so we
 931             // have to make up a name
 932             // We want to toss everything after the final '.'
 933             let dirpath = match *odir {
 934                 Some(ref d) => d.clone(),
 935                 None => PathBuf::new()
 936             };
 937
 938             // If a crate name is present, we use it as the link name
 939             let stem = sess.opts.crate_name.clone().or_else(|| {
 940                 attr::find_crate_name(attrs).map(|n| n.to_string())
 941             }).unwrap_or(input.filestem());
 942
 943             OutputFilenames {
 944                 out_directory: dirpath,
 945                 out_filestem: stem,
 946                 single_output_file: None,
 947                 extra: sess.opts.cg.extra_filename.clone(),
 948             }
 949         }
 950
 951         Some(ref out_file) => {
 952             let ofile = if sess.opts.output_types.len() > 1 {
 953                 sess.warn("ignoring specified output filename because multiple \
 954                            outputs were requested");
 955                 None
 956             } else {
 957                 Some(out_file.clone())
 958             };
 959             if *odir != None {
 960                 sess.warn("ignoring --out-dir flag due to -o flag.");
 961             }
 962
 963             let cur_dir = Path::new("");
 964
 965             OutputFilenames {
 966                 out_directory: out_file.parent().unwrap_or(cur_dir).to_path_buf(),
 967                 out_filestem: out_file.file_stem().unwrap()
 968                                       .to_str().unwrap().to_string(),
 969                 single_output_file: ofile,
 970                 extra: sess.opts.cg.extra_filename.clone(),
 971             }
 972         }
 973     }
 974 }