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 use rustc_privacy;
  30
  31 use serialize::json;
  32
  33 use std::env;
  34 use std::ffi::OsString;
  35 use std::old_io::fs;
  36 use std::old_io;
  37 use syntax::ast;
  38 use syntax::ast_map;
  39 use syntax::attr;
  40 use syntax::attr::{AttrMetaMethods};
  41 use syntax::diagnostics;
  42 use syntax::parse;
  43 use syntax::parse::token;
  44 use syntax;
  45
  46 pub fn compile_input(sess: Session,
  47                      cfg: ast::CrateConfig,
  48                      input: &Input,
  49                      outdir: &Option<Path>,
  50                      output: &Option<Path>,
  51                      addl_plugins: Option<Vec<String>>,
  52                      control: CompileController) {
  53     macro_rules! controller_entry_point{($point: ident, $make_state: expr) => ({
  54         {
  55             let state = $make_state;
  56             (control.$point.callback)(state);
  57         }
  58         if control.$point.stop {
  59             return;
  60         }
  61     })}
  62
  63     // We need nested scopes here, because the intermediate results can keep
  64     // large chunks of memory alive and we want to free them as soon as
  65     // possible to keep the peak memory usage low
  66     let (outputs, trans, sess) = {
  67         let (outputs, expanded_crate, id) = {
  68             let krate = phase_1_parse_input(&sess, cfg, input);
  69
  70             controller_entry_point!(after_parse,
  71                                     CompileState::state_after_parse(input,
  72                                                                     &sess,
  73                                                                     outdir,
  74                                                                     &krate));
  75
  76             let outputs = build_output_filenames(input,
  77                                                  outdir,
  78                                                  output,
  79                                                  &krate.attrs[],
  80                                                  &sess);
  81             let id = link::find_crate_name(Some(&sess),
  82                                            &krate.attrs[],
  83                                            input);
  84             let expanded_crate
  85                 = match phase_2_configure_and_expand(&sess,
  86                                                      krate,
  87                                                      &id[],
  88                                                      addl_plugins) {
  89                     None => return,
  90                     Some(k) => k
  91                 };
  92
  93             (outputs, expanded_crate, id)
  94         };
  95
  96         controller_entry_point!(after_expand,
  97                                 CompileState::state_after_expand(input,
  98                                                                  &sess,
  99                                                                  outdir,
 100                                                                  &expanded_crate,
 101                                                                  &id[]));
 102
 103         let mut forest = ast_map::Forest::new(expanded_crate);
 104         let arenas = ty::CtxtArenas::new();
 105         let ast_map = assign_node_ids_and_map(&sess, &mut forest);
 106
 107         write_out_deps(&sess, input, &outputs, &id[]);
 108
 109         controller_entry_point!(after_write_deps,
 110                                 CompileState::state_after_write_deps(input,
 111                                                                      &sess,
 112                                                                      outdir,
 113                                                                      &ast_map,
 114                                                                      &id[]));
 115
 116         let analysis = phase_3_run_analysis_passes(sess,
 117                                                    ast_map,
 118                                                    &arenas,
 119                                                    id,
 120                                                    control.make_glob_map);
 121
 122         controller_entry_point!(after_analysis,
 123                                 CompileState::state_after_analysis(input,
 124                                                                    &analysis.ty_cx.sess,
 125                                                                    outdir,
 126                                                                    analysis.ty_cx.map.krate(),
 127                                                                    &analysis,
 128                                                                    &analysis.ty_cx));
 129
 130         if log_enabled!(::log::INFO) {
 131             println!("Pre-trans");
 132             analysis.ty_cx.print_debug_stats();
 133         }
 134         let (tcx, trans) = phase_4_translate_to_llvm(analysis);
 135
 136         if log_enabled!(::log::INFO) {
 137             println!("Post-trans");
 138             tcx.print_debug_stats();
 139         }
 140
 141         // Discard interned strings as they are no longer required.
 142         token::get_ident_interner().clear();
 143
 144         (outputs, trans, tcx.sess)
 145     };
 146     phase_5_run_llvm_passes(&sess, &trans, &outputs);
 147
 148     controller_entry_point!(after_llvm,
 149                             CompileState::state_after_llvm(input,
 150                                                            &sess,
 151                                                            outdir,
 152                                                            &trans));
 153
 154     phase_6_link_output(&sess, &trans, &outputs);
 155 }
 156
 157 /// The name used for source code that doesn't originate in a file
 158 /// (e.g. source from stdin or a string)
 159 pub fn anon_src() -> String {
 160     "<anon>".to_string()
 161 }
 162
 163 pub fn source_name(input: &Input) -> String {
 164     match *input {
 165         // FIXME (#9639): This needs to handle non-utf8 paths
 166         Input::File(ref ifile) => ifile.as_str().unwrap().to_string(),
 167         Input::Str(_) => anon_src()
 168     }
 169 }
 170
 171 /// CompileController is used to customise compilation, it allows compilation to
 172 /// be stopped and/or to call arbitrary code at various points in compilation.
 173 /// It also allows for various flags to be set to influence what information gets
 174 /// colelcted during compilation.
 175 ///
 176 /// This is a somewhat higher level controller than a Session - the Session
 177 /// controls what happens in each phase, whereas the CompileController controls
 178 /// whether a phase is run at all and whether other code (from outside the
 179 /// the compiler) is run between phases.
 180 ///
 181 /// Note that if compilation is set to stop and a callback is provided for a
 182 /// given entry point, the callback is called before compilation is stopped.
 183 ///
 184 /// Expect more entry points to be added in the future.
 185 pub struct CompileController<'a> {
 186     pub after_parse: PhaseController<'a>,
 187     pub after_expand: PhaseController<'a>,
 188     pub after_write_deps: PhaseController<'a>,
 189     pub after_analysis: PhaseController<'a>,
 190     pub after_llvm: PhaseController<'a>,
 191
 192     pub make_glob_map: resolve::MakeGlobMap,
 193 }
 194
 195 impl<'a> CompileController<'a> {
 196     pub fn basic() -> CompileController<'a> {
 197         CompileController {
 198             after_parse: PhaseController::basic(),
 199             after_expand: PhaseController::basic(),
 200             after_write_deps:  PhaseController::basic(),
 201             after_analysis: PhaseController::basic(),
 202             after_llvm: PhaseController::basic(),
 203             make_glob_map: resolve::MakeGlobMap::No,
 204         }
 205     }
 206 }
 207
 208 pub struct PhaseController<'a> {
 209     pub stop: bool,
 210     pub callback: Box<Fn(CompileState) -> () + 'a>,
 211 }
 212
 213 impl<'a> PhaseController<'a> {
 214     pub fn basic() -> PhaseController<'a> {
 215         PhaseController {
 216             stop: false,
 217             callback: box |&: _| {},
 218         }
 219     }
 220 }
 221
 222 /// State that is passed to a callback. What state is available depends on when
 223 /// during compilation the callback is made. See the various constructor methods
 224 /// (`state_*`) in the impl to see which data is provided for any given entry point.
 225 pub struct CompileState<'a, 'ast: 'a, 'tcx: 'a> {
 226     pub input: &'a Input,
 227     pub session: &'a Session,
 228     pub cfg: Option<&'a ast::CrateConfig>,
 229     pub krate: Option<&'a ast::Crate>,
 230     pub crate_name: Option<&'a str>,
 231     pub output_filenames: Option<&'a OutputFilenames>,
 232     pub out_dir: Option<&'a Path>,
 233     pub expanded_crate: Option<&'a ast::Crate>,
 234     pub ast_map: Option<&'a ast_map::Map<'ast>>,
 235     pub analysis: Option<&'a ty::CrateAnalysis<'tcx>>,
 236     pub tcx: Option<&'a ty::ctxt<'tcx>>,
 237     pub trans: Option<&'a trans::CrateTranslation>,
 238 }
 239
 240 impl<'a, 'ast, 'tcx> CompileState<'a, 'ast, 'tcx> {
 241     fn empty(input: &'a Input,
 242              session: &'a Session,
 243              out_dir: &'a Option<Path>)
 244              -> CompileState<'a, 'ast, 'tcx> {
 245         CompileState {
 246             input: input,
 247             session: session,
 248             out_dir: out_dir.as_ref(),
 249             cfg: None,
 250             krate: None,
 251             crate_name: None,
 252             output_filenames: None,
 253             expanded_crate: None,
 254             ast_map: None,
 255             analysis: None,
 256             tcx: None,
 257             trans: None,
 258         }
 259     }
 260
 261     fn state_after_parse(input: &'a Input,
 262                          session: &'a Session,
 263                          out_dir: &'a Option<Path>,
 264                          krate: &'a ast::Crate)
 265                          -> CompileState<'a, 'ast, 'tcx> {
 266         CompileState {
 267             krate: Some(krate),
 268             .. CompileState::empty(input, session, out_dir)
 269         }
 270     }
 271
 272     fn state_after_expand(input: &'a Input,
 273                           session: &'a Session,
 274                           out_dir: &'a Option<Path>,
 275                           expanded_crate: &'a ast::Crate,
 276                           crate_name: &'a str)
 277                           -> CompileState<'a, 'ast, 'tcx> {
 278         CompileState {
 279             crate_name: Some(crate_name),
 280             expanded_crate: Some(expanded_crate),
 281             .. CompileState::empty(input, session, out_dir)
 282         }
 283     }
 284
 285     fn state_after_write_deps(input: &'a Input,
 286                               session: &'a Session,
 287                               out_dir: &'a Option<Path>,
 288                               ast_map: &'a ast_map::Map<'ast>,
 289                               crate_name: &'a str)
 290                               -> CompileState<'a, 'ast, 'tcx> {
 291         CompileState {
 292             crate_name: Some(crate_name),
 293             ast_map: Some(ast_map),
 294             .. CompileState::empty(input, session, out_dir)
 295         }
 296     }
 297
 298     fn state_after_analysis(input: &'a Input,
 299                             session: &'a Session,
 300                             out_dir: &'a Option<Path>,
 301                             krate: &'a ast::Crate,
 302                             analysis: &'a ty::CrateAnalysis<'tcx>,
 303                             tcx: &'a ty::ctxt<'tcx>)
 304                             -> CompileState<'a, 'ast, 'tcx> {
 305         CompileState {
 306             analysis: Some(analysis),
 307             tcx: Some(tcx),
 308             krate: Some(krate),
 309             .. CompileState::empty(input, session, out_dir)
 310         }
 311     }
 312
 313
 314     fn state_after_llvm(input: &'a Input,
 315                         session: &'a Session,
 316                         out_dir: &'a Option<Path>,
 317                         trans: &'a trans::CrateTranslation)
 318                         -> CompileState<'a, 'ast, 'tcx> {
 319         CompileState {
 320             trans: Some(trans),
 321             .. CompileState::empty(input, session, out_dir)
 322         }
 323     }
 324 }
 325
 326 pub fn phase_1_parse_input(sess: &Session, cfg: ast::CrateConfig, input: &Input)
 327     -> ast::Crate {
 328     // These may be left in an incoherent state after a previous compile.
 329     // `clear_tables` and `get_ident_interner().clear()` can be used to free
 330     // memory, but they do not restore the initial state.
 331     syntax::ext::mtwt::reset_tables();
 332     token::reset_ident_interner();
 333
 334     let krate = time(sess.time_passes(), "parsing", (), |_| {
 335         match *input {
 336             Input::File(ref file) => {
 337                 parse::parse_crate_from_file(&(*file), cfg.clone(), &sess.parse_sess)
 338             }
 339             Input::Str(ref src) => {
 340                 parse::parse_crate_from_source_str(anon_src().to_string(),
 341                                                    src.to_string(),
 342                                                    cfg.clone(),
 343                                                    &sess.parse_sess)
 344             }
 345         }
 346     });
 347
 348     if sess.opts.debugging_opts.ast_json_noexpand {
 349         println!("{}", json::as_json(&krate));
 350     }
 351
 352     if let Some(ref s) = sess.opts.show_span {
 353         syntax::show_span::run(sess.diagnostic(), s.as_slice(), &krate);
 354     }
 355
 356     krate
 357 }
 358
 359 // For continuing compilation after a parsed crate has been
 360 // modified
 361
 362 /// Run the "early phases" of the compiler: initial `cfg` processing,
 363 /// loading compiler plugins (including those from `addl_plugins`),
 364 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
 365 /// harness if one is to be provided and injection of a dependency on the
 366 /// standard library and prelude.
 367 ///
 368 /// Returns `None` if we're aborting after handling -W help.
 369 pub fn phase_2_configure_and_expand(sess: &Session,
 370                                     mut krate: ast::Crate,
 371                                     crate_name: &str,
 372                                     addl_plugins: Option<Vec<String>>)
 373                                     -> Option<ast::Crate> {
 374     let time_passes = sess.time_passes();
 375
 376     *sess.crate_types.borrow_mut() =
 377         collect_crate_types(sess, &krate.attrs[]);
 378     *sess.crate_metadata.borrow_mut() =
 379         collect_crate_metadata(sess, &krate.attrs[]);
 380
 381     time(time_passes, "recursion limit", (), |_| {
 382         middle::recursion_limit::update_recursion_limit(sess, &krate);
 383     });
 384
 385     // strip before expansion to allow macros to depend on
 386     // configuration variables e.g/ in
 387     //
 388     //   #[macro_use] #[cfg(foo)]
 389     //   mod bar { macro_rules! baz!(() => {{}}) }
 390     //
 391     // baz! should not use this definition unless foo is enabled.
 392
 393     time(time_passes, "gated macro checking", (), |_| {
 394         let features =
 395             syntax::feature_gate::check_crate_macros(sess.codemap(),
 396                                                      &sess.parse_sess.span_diagnostic,
 397                                                      &krate);
 398
 399         // these need to be set "early" so that expansion sees `quote` if enabled.
 400         *sess.features.borrow_mut() = features;
 401         sess.abort_if_errors();
 402     });
 403
 404     krate = time(time_passes, "configuration 1", krate, |krate|
 405                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 406
 407     krate = time(time_passes, "crate injection", krate, |krate|
 408                  syntax::std_inject::maybe_inject_crates_ref(krate,
 409                                                              sess.opts.alt_std_name.clone()));
 410
 411     let mut addl_plugins = Some(addl_plugins);
 412     let Plugins { macros, registrars }
 413         = time(time_passes, "plugin loading", (), |_|
 414                plugin::load::load_plugins(sess, &krate, addl_plugins.take().unwrap()));
 415
 416     let mut registry = Registry::new(sess, &krate);
 417
 418     time(time_passes, "plugin registration", registrars, |registrars| {
 419         if sess.features.borrow().rustc_diagnostic_macros {
 420             registry.register_macro("__diagnostic_used",
 421                 diagnostics::plugin::expand_diagnostic_used);
 422             registry.register_macro("__register_diagnostic",
 423                 diagnostics::plugin::expand_register_diagnostic);
 424             registry.register_macro("__build_diagnostic_array",
 425                 diagnostics::plugin::expand_build_diagnostic_array);
 426         }
 427
 428         for registrar in registrars.into_iter() {
 429             registry.args_hidden = Some(registrar.args);
 430             (registrar.fun)(&mut registry);
 431         }
 432     });
 433
 434     let Registry { syntax_exts, lint_passes, lint_groups, .. } = registry;
 435
 436     {
 437         let mut ls = sess.lint_store.borrow_mut();
 438         for pass in lint_passes.into_iter() {
 439             ls.register_pass(Some(sess), true, pass);
 440         }
 441
 442         for (name, to) in lint_groups.into_iter() {
 443             ls.register_group(Some(sess), true, name, to);
 444         }
 445     }
 446
 447     // Lint plugins are registered; now we can process command line flags.
 448     if sess.opts.describe_lints {
 449         super::describe_lints(&*sess.lint_store.borrow(), true);
 450         return None;
 451     }
 452     sess.lint_store.borrow_mut().process_command_line(sess);
 453
 454     // Abort if there are errors from lint processing or a plugin registrar.
 455     sess.abort_if_errors();
 456
 457     krate = time(time_passes, "expansion", (krate, macros, syntax_exts),
 458         |(krate, macros, syntax_exts)| {
 459             // Windows dlls do not have rpaths, so they don't know how to find their
 460             // dependencies. It's up to us to tell the system where to find all the
 461             // dependent dlls. Note that this uses cfg!(windows) as opposed to
 462             // targ_cfg because syntax extensions are always loaded for the host
 463             // compiler, not for the target.
 464             let mut _old_path = OsString::from_str("");
 465             if cfg!(windows) {
 466                 _old_path = env::var("PATH").unwrap_or(_old_path);
 467                 let mut new_path = sess.host_filesearch(PathKind::All).get_dylib_search_paths();
 468                 new_path.extend(env::split_paths(&_old_path));
 469                 env::set_var("PATH", &env::join_paths(new_path.iter()).unwrap());
 470             }
 471             let cfg = syntax::ext::expand::ExpansionConfig {
 472                 crate_name: crate_name.to_string(),
 473                 enable_quotes: sess.features.borrow().quote,
 474                 recursion_limit: sess.recursion_limit.get(),
 475             };
 476             let ret = syntax::ext::expand::expand_crate(&sess.parse_sess,
 477                                               cfg,
 478                                               macros,
 479                                               syntax_exts,
 480                                               krate);
 481             if cfg!(windows) {
 482                 env::set_var("PATH", &_old_path);
 483             }
 484             ret
 485         }
 486     );
 487
 488     // Needs to go *after* expansion to be able to check the results of macro expansion.
 489     time(time_passes, "complete gated feature checking", (), |_| {
 490         let features =
 491             syntax::feature_gate::check_crate(sess.codemap(),
 492                                           &sess.parse_sess.span_diagnostic,
 493                                           &krate);
 494         *sess.features.borrow_mut() = features;
 495         sess.abort_if_errors();
 496     });
 497
 498     // JBC: make CFG processing part of expansion to avoid this problem:
 499
 500     // strip again, in case expansion added anything with a #[cfg].
 501     krate = time(time_passes, "configuration 2", krate, |krate|
 502                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 503
 504     krate = time(time_passes, "maybe building test harness", krate, |krate|
 505                  syntax::test::modify_for_testing(&sess.parse_sess,
 506                                                   &sess.opts.cfg,
 507                                                   krate,
 508                                                   sess.diagnostic()));
 509
 510     krate = time(time_passes, "prelude injection", krate, |krate|
 511                  syntax::std_inject::maybe_inject_prelude(krate));
 512
 513     time(time_passes, "checking that all macro invocations are gone", &krate, |krate|
 514          syntax::ext::expand::check_for_macros(&sess.parse_sess, krate));
 515
 516     Some(krate)
 517 }
 518
 519 pub fn assign_node_ids_and_map<'ast>(sess: &Session,
 520                                      forest: &'ast mut ast_map::Forest)
 521                                      -> ast_map::Map<'ast> {
 522     struct NodeIdAssigner<'a> {
 523         sess: &'a Session
 524     }
 525
 526     impl<'a> ast_map::FoldOps for NodeIdAssigner<'a> {
 527         fn new_id(&self, old_id: ast::NodeId) -> ast::NodeId {
 528             assert_eq!(old_id, ast::DUMMY_NODE_ID);
 529             self.sess.next_node_id()
 530         }
 531     }
 532
 533     let map = time(sess.time_passes(), "assigning node ids and indexing ast", forest, |forest|
 534                    ast_map::map_crate(forest, NodeIdAssigner { sess: sess }));
 535
 536     if sess.opts.debugging_opts.ast_json {
 537         println!("{}", json::as_json(map.krate()));
 538     }
 539
 540     map
 541 }
 542
 543 /// Run the resolution, typechecking, region checking and other
 544 /// miscellaneous analysis passes on the crate. Return various
 545 /// structures carrying the results of the analysis.
 546 pub fn phase_3_run_analysis_passes<'tcx>(sess: Session,
 547                                          ast_map: ast_map::Map<'tcx>,
 548                                          arenas: &'tcx ty::CtxtArenas<'tcx>,
 549                                          name: String,
 550                                          make_glob_map: resolve::MakeGlobMap)
 551                                          -> ty::CrateAnalysis<'tcx> {
 552     let time_passes = sess.time_passes();
 553     let krate = ast_map.krate();
 554
 555     time(time_passes, "external crate/lib resolution", (), |_|
 556          CrateReader::new(&sess).read_crates(krate));
 557
 558     let lang_items = time(time_passes, "language item collection", (), |_|
 559                           middle::lang_items::collect_language_items(krate, &sess));
 560
 561     let resolve::CrateMap {
 562         def_map,
 563         freevars,
 564         export_map,
 565         trait_map,
 566         external_exports,
 567         last_private_map,
 568         glob_map,
 569     } =
 570         time(time_passes, "resolution", (),
 571              |_| resolve::resolve_crate(&sess,
 572                                         &ast_map,
 573                                         &lang_items,
 574                                         krate,
 575                                         make_glob_map));
 576
 577     // Discard MTWT tables that aren't required past resolution.
 578     syntax::ext::mtwt::clear_tables();
 579
 580     let named_region_map = time(time_passes, "lifetime resolution", (),
 581                                 |_| middle::resolve_lifetime::krate(&sess, krate, &def_map));
 582
 583     time(time_passes, "looking for entry point", (),
 584          |_| middle::entry::find_entry_point(&sess, &ast_map));
 585
 586     sess.plugin_registrar_fn.set(
 587         time(time_passes, "looking for plugin registrar", (), |_|
 588             plugin::build::find_plugin_registrar(
 589                 sess.diagnostic(), krate)));
 590
 591     let region_map = time(time_passes, "region resolution", (), |_|
 592                           middle::region::resolve_crate(&sess, krate));
 593
 594     time(time_passes, "loop checking", (), |_|
 595          middle::check_loop::check_crate(&sess, krate));
 596
 597     let stability_index = time(time_passes, "stability index", (), |_|
 598                                stability::Index::build(&sess, krate));
 599
 600     time(time_passes, "static item recursion checking", (), |_|
 601          middle::check_static_recursion::check_crate(&sess, krate, &def_map, &ast_map));
 602
 603     let ty_cx = ty::mk_ctxt(sess,
 604                             arenas,
 605                             def_map,
 606                             named_region_map,
 607                             ast_map,
 608                             freevars,
 609                             region_map,
 610                             lang_items,
 611                             stability_index);
 612
 613     // passes are timed inside typeck
 614     typeck::check_crate(&ty_cx, trait_map);
 615
 616     time(time_passes, "check static items", (), |_|
 617          middle::check_static::check_crate(&ty_cx));
 618
 619     // These next two const passes can probably be merged
 620     time(time_passes, "const marking", (), |_|
 621          middle::const_eval::process_crate(&ty_cx));
 622
 623     time(time_passes, "const checking", (), |_|
 624          middle::check_const::check_crate(&ty_cx));
 625
 626     let maps = (external_exports, last_private_map);
 627     let (exported_items, public_items) =
 628             time(time_passes, "privacy checking", maps, |(a, b)|
 629                  rustc_privacy::check_crate(&ty_cx, &export_map, a, b));
 630
 631     time(time_passes, "intrinsic checking", (), |_|
 632          middle::intrinsicck::check_crate(&ty_cx));
 633
 634     time(time_passes, "effect checking", (), |_|
 635          middle::effect::check_crate(&ty_cx));
 636
 637     time(time_passes, "match checking", (), |_|
 638          middle::check_match::check_crate(&ty_cx));
 639
 640     time(time_passes, "liveness checking", (), |_|
 641          middle::liveness::check_crate(&ty_cx));
 642
 643     time(time_passes, "borrow checking", (), |_|
 644          borrowck::check_crate(&ty_cx));
 645
 646     time(time_passes, "rvalue checking", (), |_|
 647          middle::check_rvalues::check_crate(&ty_cx, krate));
 648
 649     // Avoid overwhelming user with errors if type checking failed.
 650     // I'm not sure how helpful this is, to be honest, but it avoids a
 651     // lot of annoying errors in the compile-fail tests (basically,
 652     // lint warnings and so on -- kindck used to do this abort, but
 653     // kindck is gone now). -nmatsakis
 654     ty_cx.sess.abort_if_errors();
 655
 656     let reachable_map =
 657         time(time_passes, "reachability checking", (), |_|
 658              reachable::find_reachable(&ty_cx, &exported_items));
 659
 660     time(time_passes, "death checking", (), |_| {
 661         middle::dead::check_crate(&ty_cx,
 662                                   &exported_items,
 663                                   &reachable_map)
 664     });
 665
 666     let ref lib_features_used =
 667         time(time_passes, "stability checking", (), |_|
 668              stability::check_unstable_api_usage(&ty_cx));
 669
 670     time(time_passes, "unused feature checking", (), |_|
 671          stability::check_unused_features(
 672              &ty_cx.sess, lib_features_used));
 673
 674     time(time_passes, "lint checking", (), |_|
 675          lint::check_crate(&ty_cx, &exported_items));
 676
 677     // The above three passes generate errors w/o aborting
 678     ty_cx.sess.abort_if_errors();
 679
 680     ty::CrateAnalysis {
 681         export_map: export_map,
 682         ty_cx: ty_cx,
 683         exported_items: exported_items,
 684         public_items: public_items,
 685         reachable: reachable_map,
 686         name: name,
 687         glob_map: glob_map,
 688     }
 689 }
 690
 691 /// Run the translation phase to LLVM, after which the AST and analysis can
 692 /// be discarded.
 693 pub fn phase_4_translate_to_llvm<'tcx>(analysis: ty::CrateAnalysis<'tcx>)
 694                                        -> (ty::ctxt<'tcx>, trans::CrateTranslation) {
 695     let time_passes = analysis.ty_cx.sess.time_passes();
 696
 697     time(time_passes, "resolving dependency formats", (), |_|
 698          dependency_format::calculate(&analysis.ty_cx));
 699
 700     // Option dance to work around the lack of stack once closures.
 701     time(time_passes, "translation", analysis, |analysis|
 702          trans::trans_crate(analysis))
 703 }
 704
 705 /// Run LLVM itself, producing a bitcode file, assembly file or object file
 706 /// as a side effect.
 707 pub fn phase_5_run_llvm_passes(sess: &Session,
 708                                trans: &trans::CrateTranslation,
 709                                outputs: &OutputFilenames) {
 710     if sess.opts.cg.no_integrated_as {
 711         let output_type = config::OutputTypeAssembly;
 712
 713         time(sess.time_passes(), "LLVM passes", (), |_|
 714             write::run_passes(sess, trans, &[output_type], outputs));
 715
 716         write::run_assembler(sess, outputs);
 717
 718         // Remove assembly source, unless --save-temps was specified
 719         if !sess.opts.cg.save_temps {
 720             fs::unlink(&outputs.temp_path(config::OutputTypeAssembly)).unwrap();
 721         }
 722     } else {
 723         time(sess.time_passes(), "LLVM passes", (), |_|
 724             write::run_passes(sess,
 725                               trans,
 726                               &sess.opts.output_types[],
 727                               outputs));
 728     }
 729
 730     sess.abort_if_errors();
 731 }
 732
 733 /// Run the linker on any artifacts that resulted from the LLVM run.
 734 /// This should produce either a finished executable or library.
 735 pub fn phase_6_link_output(sess: &Session,
 736                            trans: &trans::CrateTranslation,
 737                            outputs: &OutputFilenames) {
 738     let old_path = env::var("PATH").unwrap_or(OsString::from_str(""));
 739     let mut new_path = sess.host_filesearch(PathKind::All).get_tools_search_paths();
 740     new_path.extend(env::split_paths(&old_path));
 741     env::set_var("PATH", &env::join_paths(new_path.iter()).unwrap());
 742
 743     time(sess.time_passes(), "linking", (), |_|
 744          link::link_binary(sess,
 745                            trans,
 746                            outputs,
 747                            &trans.link.crate_name[]));
 748
 749     env::set_var("PATH", &old_path);
 750 }
 751
 752 fn escape_dep_filename(filename: &str) -> String {
 753     // Apparently clang and gcc *only* escape spaces:
 754     // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
 755     filename.replace(" ", "\\ ")
 756 }
 757
 758 fn write_out_deps(sess: &Session,
 759                   input: &Input,
 760                   outputs: &OutputFilenames,
 761                   id: &str) {
 762
 763     let mut out_filenames = Vec::new();
 764     for output_type in sess.opts.output_types.iter() {
 765         let file = outputs.path(*output_type);
 766         match *output_type {
 767             config::OutputTypeExe => {
 768                 for output in sess.crate_types.borrow().iter() {
 769                     let p = link::filename_for_input(sess, *output,
 770                                                      id, &file);
 771                     out_filenames.push(p);
 772                 }
 773             }
 774             _ => { out_filenames.push(file); }
 775         }
 776     }
 777
 778     // Write out dependency rules to the dep-info file if requested with
 779     // --dep-info
 780     let deps_filename = match sess.opts.write_dependency_info {
 781         // Use filename from --dep-file argument if given
 782         (true, Some(ref filename)) => filename.clone(),
 783         // Use default filename: crate source filename with extension replaced
 784         // by ".d"
 785         (true, None) => match *input {
 786             Input::File(..) => outputs.with_extension("d"),
 787             Input::Str(..) => {
 788                 sess.warn("can not write --dep-info without a filename \
 789                            when compiling stdin.");
 790                 return
 791             },
 792         },
 793         _ => return,
 794     };
 795
 796     let result = (|&:| -> old_io::IoResult<()> {
 797         // Build a list of files used to compile the output and
 798         // write Makefile-compatible dependency rules
 799         let files: Vec<String> = sess.codemap().files.borrow()
 800                                    .iter().filter(|fmap| fmap.is_real_file())
 801                                    .map(|fmap| escape_dep_filename(&fmap.name[]))
 802                                    .collect();
 803         let mut file = try!(old_io::File::create(&deps_filename));
 804         for path in out_filenames.iter() {
 805             try!(write!(&mut file as &mut Writer,
 806                           "{}: {}\n\n", path.display(), files.connect(" ")));
 807         }
 808         Ok(())
 809     })();
 810
 811     match result {
 812         Ok(()) => {}
 813         Err(e) => {
 814             sess.fatal(&format!("error writing dependencies to `{}`: {}",
 815                                deps_filename.display(), e)[]);
 816         }
 817     }
 818 }
 819
 820 pub fn collect_crate_types(session: &Session,
 821                            attrs: &[ast::Attribute]) -> Vec<config::CrateType> {
 822     // Unconditionally collect crate types from attributes to make them used
 823     let attr_types: Vec<config::CrateType> = attrs.iter().filter_map(|a| {
 824         if a.check_name("crate_type") {
 825             match a.value_str() {
 826                 Some(ref n) if *n == "rlib" => {
 827                     Some(config::CrateTypeRlib)
 828                 }
 829                 Some(ref n) if *n == "dylib" => {
 830                     Some(config::CrateTypeDylib)
 831                 }
 832                 Some(ref n) if *n == "lib" => {
 833                     Some(config::default_lib_output())
 834                 }
 835                 Some(ref n) if *n == "staticlib" => {
 836                     Some(config::CrateTypeStaticlib)
 837                 }
 838                 Some(ref n) if *n == "bin" => Some(config::CrateTypeExecutable),
 839                 Some(_) => {
 840                     session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
 841                                      ast::CRATE_NODE_ID,
 842                                      a.span,
 843                                      "invalid `crate_type` \
 844                                       value".to_string());
 845                     None
 846                 }
 847                 _ => {
 848                     session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
 849                                      ast::CRATE_NODE_ID,
 850                                      a.span,
 851                                      "`crate_type` requires a \
 852                                       value".to_string());
 853                     None
 854                 }
 855             }
 856         } else {
 857             None
 858         }
 859     }).collect();
 860
 861     // If we're generating a test executable, then ignore all other output
 862     // styles at all other locations
 863     if session.opts.test {
 864         return vec!(config::CrateTypeExecutable)
 865     }
 866
 867     // Only check command line flags if present. If no types are specified by
 868     // command line, then reuse the empty `base` Vec to hold the types that
 869     // will be found in crate attributes.
 870     let mut base = session.opts.crate_types.clone();
 871     if base.len() == 0 {
 872         base.extend(attr_types.into_iter());
 873         if base.len() == 0 {
 874             base.push(link::default_output_for_target(session));
 875         }
 876         base.sort();
 877         base.dedup();
 878     }
 879
 880     base.into_iter().filter(|crate_type| {
 881         let res = !link::invalid_output_for_target(session, *crate_type);
 882
 883         if !res {
 884             session.warn(&format!("dropping unsupported crate type `{}` \
 885                                    for target `{}`",
 886                                  *crate_type, session.opts.target_triple)[]);
 887         }
 888
 889         res
 890     }).collect()
 891 }
 892
 893 pub fn collect_crate_metadata(session: &Session,
 894                               _attrs: &[ast::Attribute]) -> Vec<String> {
 895     session.opts.cg.metadata.clone()
 896 }
 897
 898 pub fn build_output_filenames(input: &Input,
 899                               odir: &Option<Path>,
 900                               ofile: &Option<Path>,
 901                               attrs: &[ast::Attribute],
 902                               sess: &Session)
 903                            -> OutputFilenames {
 904     match *ofile {
 905         None => {
 906             // "-" as input file will cause the parser to read from stdin so we
 907             // have to make up a name
 908             // We want to toss everything after the final '.'
 909             let dirpath = match *odir {
 910                 Some(ref d) => d.clone(),
 911                 None => Path::new(".")
 912             };
 913
 914             // If a crate name is present, we use it as the link name
 915             let stem = sess.opts.crate_name.clone().or_else(|| {
 916                 attr::find_crate_name(attrs).map(|n| n.get().to_string())
 917             }).unwrap_or(input.filestem());
 918
 919             OutputFilenames {
 920                 out_directory: dirpath,
 921                 out_filestem: stem,
 922                 single_output_file: None,
 923                 extra: sess.opts.cg.extra_filename.clone(),
 924             }
 925         }
 926
 927         Some(ref out_file) => {
 928             let ofile = if sess.opts.output_types.len() > 1 {
 929                 sess.warn("ignoring specified output filename because multiple \
 930                            outputs were requested");
 931                 None
 932             } else {
 933                 Some(out_file.clone())
 934             };
 935             if *odir != None {
 936                 sess.warn("ignoring --out-dir flag due to -o flag.");
 937             }
 938             OutputFilenames {
 939                 out_directory: out_file.dir_path(),
 940                 out_filestem: out_file.filestem_str().unwrap().to_string(),
 941                 single_output_file: ofile,
 942                 extra: sess.opts.cg.extra_filename.clone(),
 943             }
 944         }
 945     }
 946 }