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::ast_map;
  15 use rustc::lint;
  16 use rustc::metadata;
  17 use rustc::metadata::creader::CrateReader;
  18 use rustc::middle::{stability, ty, reachable};
  19 use rustc::middle::dependency_format;
  20 use rustc::middle;
  21 use rustc::plugin::registry::Registry;
  22 use rustc::plugin;
  23 use rustc::util::common::time;
  24 use rustc_borrowck as borrowck;
  25 use rustc_resolve as resolve;
  26 use rustc_trans::back::link;
  27 use rustc_trans::back::write;
  28 use rustc_trans::trans;
  29 use rustc_typeck as typeck;
  30 use rustc_privacy;
  31 use super::Compilation;
  32
  33 use serialize::json;
  34
  35 use std::env;
  36 use std::ffi::{OsString, OsStr};
  37 use std::fs;
  38 use std::io::{self, Write};
  39 use std::path::{Path, PathBuf};
  40 use syntax::ast;
  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 (sess, result) = {
  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         phase_3_run_analysis_passes(sess,
 123                                     ast_map,
 124                                     &arenas,
 125                                     id,
 126                                     control.make_glob_map,
 127                                     |tcx, analysis| {
 128
 129             {
 130                 let state = CompileState::state_after_analysis(input,
 131                                                                &tcx.sess,
 132                                                                outdir,
 133                                                                tcx.map.krate(),
 134                                                                &analysis,
 135                                                                tcx);
 136                 (control.after_analysis.callback)(state);
 137
 138                 tcx.sess.abort_if_errors();
 139                 if control.after_analysis.stop == Compilation::Stop {
 140                     return Err(());
 141                 }
 142             }
 143
 144             if log_enabled!(::log::INFO) {
 145                 println!("Pre-trans");
 146                 tcx.print_debug_stats();
 147             }
 148             let trans = phase_4_translate_to_llvm(tcx, analysis);
 149
 150             if log_enabled!(::log::INFO) {
 151                 println!("Post-trans");
 152                 tcx.print_debug_stats();
 153             }
 154
 155             // Discard interned strings as they are no longer required.
 156             token::get_ident_interner().clear();
 157
 158             Ok((outputs, trans))
 159         })
 160     };
 161
 162     let (outputs, trans) = if let Ok(out) = result {
 163         out
 164     } else {
 165         return;
 166     };
 167
 168     phase_5_run_llvm_passes(&sess, &trans, &outputs);
 169
 170     controller_entry_point!(after_llvm,
 171                             sess,
 172                             CompileState::state_after_llvm(input,
 173                                                            &sess,
 174                                                            outdir,
 175                                                            &trans));
 176
 177     phase_6_link_output(&sess, &trans, &outputs);
 178 }
 179
 180 /// The name used for source code that doesn't originate in a file
 181 /// (e.g. source from stdin or a string)
 182 pub fn anon_src() -> String {
 183     "<anon>".to_string()
 184 }
 185
 186 pub fn source_name(input: &Input) -> String {
 187     match *input {
 188         // FIXME (#9639): This needs to handle non-utf8 paths
 189         Input::File(ref ifile) => ifile.to_str().unwrap().to_string(),
 190         Input::Str(_) => anon_src()
 191     }
 192 }
 193
 194 /// CompileController is used to customise compilation, it allows compilation to
 195 /// be stopped and/or to call arbitrary code at various points in compilation.
 196 /// It also allows for various flags to be set to influence what information gets
 197 /// collected during compilation.
 198 ///
 199 /// This is a somewhat higher level controller than a Session - the Session
 200 /// controls what happens in each phase, whereas the CompileController controls
 201 /// whether a phase is run at all and whether other code (from outside the
 202 /// the compiler) is run between phases.
 203 ///
 204 /// Note that if compilation is set to stop and a callback is provided for a
 205 /// given entry point, the callback is called before compilation is stopped.
 206 ///
 207 /// Expect more entry points to be added in the future.
 208 pub struct CompileController<'a> {
 209     pub after_parse: PhaseController<'a>,
 210     pub after_expand: PhaseController<'a>,
 211     pub after_write_deps: PhaseController<'a>,
 212     pub after_analysis: PhaseController<'a>,
 213     pub after_llvm: PhaseController<'a>,
 214
 215     pub make_glob_map: resolve::MakeGlobMap,
 216 }
 217
 218 impl<'a> CompileController<'a> {
 219     pub fn basic() -> CompileController<'a> {
 220         CompileController {
 221             after_parse: PhaseController::basic(),
 222             after_expand: PhaseController::basic(),
 223             after_write_deps:  PhaseController::basic(),
 224             after_analysis: PhaseController::basic(),
 225             after_llvm: PhaseController::basic(),
 226             make_glob_map: resolve::MakeGlobMap::No,
 227         }
 228     }
 229 }
 230
 231 pub struct PhaseController<'a> {
 232     pub stop: Compilation,
 233     pub callback: Box<Fn(CompileState) -> () + 'a>,
 234 }
 235
 236 impl<'a> PhaseController<'a> {
 237     pub fn basic() -> PhaseController<'a> {
 238         PhaseController {
 239             stop: Compilation::Continue,
 240             callback: box |_| {},
 241         }
 242     }
 243 }
 244
 245 /// State that is passed to a callback. What state is available depends on when
 246 /// during compilation the callback is made. See the various constructor methods
 247 /// (`state_*`) in the impl to see which data is provided for any given entry point.
 248 pub struct CompileState<'a, 'ast: 'a, 'tcx: 'a> {
 249     pub input: &'a Input,
 250     pub session: &'a Session,
 251     pub cfg: Option<&'a ast::CrateConfig>,
 252     pub krate: Option<&'a ast::Crate>,
 253     pub crate_name: Option<&'a str>,
 254     pub output_filenames: Option<&'a OutputFilenames>,
 255     pub out_dir: Option<&'a Path>,
 256     pub expanded_crate: Option<&'a ast::Crate>,
 257     pub ast_map: Option<&'a ast_map::Map<'ast>>,
 258     pub analysis: Option<&'a ty::CrateAnalysis>,
 259     pub tcx: Option<&'a ty::ctxt<'tcx>>,
 260     pub trans: Option<&'a trans::CrateTranslation>,
 261 }
 262
 263 impl<'a, 'ast, 'tcx> CompileState<'a, 'ast, 'tcx> {
 264     fn empty(input: &'a Input,
 265              session: &'a Session,
 266              out_dir: &'a Option<PathBuf>)
 267              -> CompileState<'a, 'ast, 'tcx> {
 268         CompileState {
 269             input: input,
 270             session: session,
 271             out_dir: out_dir.as_ref().map(|s| &**s),
 272             cfg: None,
 273             krate: None,
 274             crate_name: None,
 275             output_filenames: None,
 276             expanded_crate: None,
 277             ast_map: None,
 278             analysis: None,
 279             tcx: None,
 280             trans: None,
 281         }
 282     }
 283
 284     fn state_after_parse(input: &'a Input,
 285                          session: &'a Session,
 286                          out_dir: &'a Option<PathBuf>,
 287                          krate: &'a ast::Crate)
 288                          -> CompileState<'a, 'ast, 'tcx> {
 289         CompileState {
 290             krate: Some(krate),
 291             .. CompileState::empty(input, session, out_dir)
 292         }
 293     }
 294
 295     fn state_after_expand(input: &'a Input,
 296                           session: &'a Session,
 297                           out_dir: &'a Option<PathBuf>,
 298                           expanded_crate: &'a ast::Crate,
 299                           crate_name: &'a str)
 300                           -> CompileState<'a, 'ast, 'tcx> {
 301         CompileState {
 302             crate_name: Some(crate_name),
 303             expanded_crate: Some(expanded_crate),
 304             .. CompileState::empty(input, session, out_dir)
 305         }
 306     }
 307
 308     fn state_after_write_deps(input: &'a Input,
 309                               session: &'a Session,
 310                               out_dir: &'a Option<PathBuf>,
 311                               ast_map: &'a ast_map::Map<'ast>,
 312                               expanded_crate: &'a ast::Crate,
 313                               crate_name: &'a str)
 314                               -> CompileState<'a, 'ast, 'tcx> {
 315         CompileState {
 316             crate_name: Some(crate_name),
 317             ast_map: Some(ast_map),
 318             expanded_crate: Some(expanded_crate),
 319             .. CompileState::empty(input, session, out_dir)
 320         }
 321     }
 322
 323     fn state_after_analysis(input: &'a Input,
 324                             session: &'a Session,
 325                             out_dir: &'a Option<PathBuf>,
 326                             expanded_crate: &'a ast::Crate,
 327                             analysis: &'a ty::CrateAnalysis,
 328                             tcx: &'a ty::ctxt<'tcx>)
 329                             -> CompileState<'a, 'ast, 'tcx> {
 330         CompileState {
 331             analysis: Some(analysis),
 332             tcx: Some(tcx),
 333             expanded_crate: Some(expanded_crate),
 334             .. CompileState::empty(input, session, out_dir)
 335         }
 336     }
 337
 338
 339     fn state_after_llvm(input: &'a Input,
 340                         session: &'a Session,
 341                         out_dir: &'a Option<PathBuf>,
 342                         trans: &'a trans::CrateTranslation)
 343                         -> CompileState<'a, 'ast, 'tcx> {
 344         CompileState {
 345             trans: Some(trans),
 346             .. CompileState::empty(input, session, out_dir)
 347         }
 348     }
 349 }
 350
 351 pub fn phase_1_parse_input(sess: &Session, cfg: ast::CrateConfig, input: &Input)
 352     -> ast::Crate {
 353     // These may be left in an incoherent state after a previous compile.
 354     // `clear_tables` and `get_ident_interner().clear()` can be used to free
 355     // memory, but they do not restore the initial state.
 356     syntax::ext::mtwt::reset_tables();
 357     token::reset_ident_interner();
 358
 359     let krate = time(sess.time_passes(), "parsing", (), |_| {
 360         match *input {
 361             Input::File(ref file) => {
 362                 parse::parse_crate_from_file(&(*file), cfg.clone(), &sess.parse_sess)
 363             }
 364             Input::Str(ref src) => {
 365                 parse::parse_crate_from_source_str(anon_src().to_string(),
 366                                                    src.to_string(),
 367                                                    cfg.clone(),
 368                                                    &sess.parse_sess)
 369             }
 370         }
 371     });
 372
 373     if sess.opts.debugging_opts.ast_json_noexpand {
 374         println!("{}", json::as_json(&krate));
 375     }
 376
 377     if let Some(ref s) = sess.opts.show_span {
 378         syntax::show_span::run(sess.diagnostic(), s, &krate);
 379     }
 380
 381     krate
 382 }
 383
 384 // For continuing compilation after a parsed crate has been
 385 // modified
 386
 387 /// Run the "early phases" of the compiler: initial `cfg` processing,
 388 /// loading compiler plugins (including those from `addl_plugins`),
 389 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
 390 /// harness if one is to be provided and injection of a dependency on the
 391 /// standard library and prelude.
 392 ///
 393 /// Returns `None` if we're aborting after handling -W help.
 394 pub fn phase_2_configure_and_expand(sess: &Session,
 395                                     mut krate: ast::Crate,
 396                                     crate_name: &str,
 397                                     addl_plugins: Option<Vec<String>>)
 398                                     -> Option<ast::Crate> {
 399     let time_passes = sess.time_passes();
 400
 401     // strip before anything else because crate metadata may use #[cfg_attr]
 402     // and so macros can depend on configuration variables, such as
 403     //
 404     //   #[macro_use] #[cfg(foo)]
 405     //   mod bar { macro_rules! baz!(() => {{}}) }
 406     //
 407     // baz! should not use this definition unless foo is enabled.
 408
 409     krate = time(time_passes, "configuration 1", krate, |krate|
 410                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 411
 412     *sess.crate_types.borrow_mut() =
 413         collect_crate_types(sess, &krate.attrs);
 414     *sess.crate_metadata.borrow_mut() =
 415         collect_crate_metadata(sess, &krate.attrs);
 416
 417     time(time_passes, "recursion limit", (), |_| {
 418         middle::recursion_limit::update_recursion_limit(sess, &krate);
 419     });
 420
 421     time(time_passes, "gated macro checking", (), |_| {
 422         let features =
 423             syntax::feature_gate::check_crate_macros(sess.codemap(),
 424                                                      &sess.parse_sess.span_diagnostic,
 425                                                      &krate);
 426
 427         // these need to be set "early" so that expansion sees `quote` if enabled.
 428         *sess.features.borrow_mut() = features;
 429         sess.abort_if_errors();
 430     });
 431
 432
 433     krate = time(time_passes, "crate injection", krate, |krate|
 434                  syntax::std_inject::maybe_inject_crates_ref(krate,
 435                                                              sess.opts.alt_std_name.clone()));
 436
 437     let macros = time(time_passes, "macro loading", (), |_|
 438         metadata::macro_import::read_macro_defs(sess, &krate));
 439
 440     let mut addl_plugins = Some(addl_plugins);
 441     let registrars = time(time_passes, "plugin loading", (), |_|
 442         plugin::load::load_plugins(sess, &krate, addl_plugins.take().unwrap()));
 443
 444     let mut registry = Registry::new(sess, &krate);
 445
 446     time(time_passes, "plugin registration", registrars, |registrars| {
 447         if sess.features.borrow().rustc_diagnostic_macros {
 448             registry.register_macro("__diagnostic_used",
 449                 diagnostics::plugin::expand_diagnostic_used);
 450             registry.register_macro("__register_diagnostic",
 451                 diagnostics::plugin::expand_register_diagnostic);
 452             registry.register_macro("__build_diagnostic_array",
 453                 diagnostics::plugin::expand_build_diagnostic_array);
 454         }
 455
 456         for registrar in registrars {
 457             registry.args_hidden = Some(registrar.args);
 458             (registrar.fun)(&mut registry);
 459         }
 460     });
 461
 462     let Registry { syntax_exts, lint_passes, lint_groups,
 463                    llvm_passes, attributes, .. } = registry;
 464
 465     {
 466         let mut ls = sess.lint_store.borrow_mut();
 467         for pass in lint_passes {
 468             ls.register_pass(Some(sess), true, pass);
 469         }
 470
 471         for (name, to) in lint_groups {
 472             ls.register_group(Some(sess), true, name, to);
 473         }
 474
 475         *sess.plugin_llvm_passes.borrow_mut() = llvm_passes;
 476         *sess.plugin_attributes.borrow_mut() = attributes.clone();
 477     }
 478
 479     // Lint plugins are registered; now we can process command line flags.
 480     if sess.opts.describe_lints {
 481         super::describe_lints(&*sess.lint_store.borrow(), true);
 482         return None;
 483     }
 484     sess.lint_store.borrow_mut().process_command_line(sess);
 485
 486     // Abort if there are errors from lint processing or a plugin registrar.
 487     sess.abort_if_errors();
 488
 489     krate = time(time_passes, "expansion", (krate, macros, syntax_exts),
 490         |(krate, macros, syntax_exts)| {
 491             // Windows dlls do not have rpaths, so they don't know how to find their
 492             // dependencies. It's up to us to tell the system where to find all the
 493             // dependent dlls. Note that this uses cfg!(windows) as opposed to
 494             // targ_cfg because syntax extensions are always loaded for the host
 495             // compiler, not for the target.
 496             let mut _old_path = OsString::new();
 497             if cfg!(windows) {
 498                 _old_path = env::var_os("PATH").unwrap_or(_old_path);
 499                 let mut new_path = sess.host_filesearch(PathKind::All)
 500                                        .get_dylib_search_paths();
 501                 new_path.extend(env::split_paths(&_old_path));
 502                 env::set_var("PATH", &env::join_paths(new_path).unwrap());
 503             }
 504             let features = sess.features.borrow();
 505             let cfg = syntax::ext::expand::ExpansionConfig {
 506                 crate_name: crate_name.to_string(),
 507                 features: Some(&features),
 508                 recursion_limit: sess.recursion_limit.get(),
 509                 trace_mac: sess.opts.debugging_opts.trace_macros,
 510             };
 511             let ret = syntax::ext::expand::expand_crate(&sess.parse_sess,
 512                                               cfg,
 513                                               macros,
 514                                               syntax_exts,
 515                                               krate);
 516             if cfg!(windows) {
 517                 env::set_var("PATH", &_old_path);
 518             }
 519             ret
 520         }
 521     );
 522
 523     // Needs to go *after* expansion to be able to check the results
 524     // of macro expansion.  This runs before #[cfg] to try to catch as
 525     // much as possible (e.g. help the programmer avoid platform
 526     // specific differences)
 527     time(time_passes, "complete gated feature checking 1", (), |_| {
 528         let features =
 529             syntax::feature_gate::check_crate(sess.codemap(),
 530                                               &sess.parse_sess.span_diagnostic,
 531                                               &krate, &attributes,
 532                                               sess.opts.unstable_features);
 533         *sess.features.borrow_mut() = features;
 534         sess.abort_if_errors();
 535     });
 536
 537     // JBC: make CFG processing part of expansion to avoid this problem:
 538
 539     // strip again, in case expansion added anything with a #[cfg].
 540     krate = time(time_passes, "configuration 2", krate, |krate|
 541                  syntax::config::strip_unconfigured_items(sess.diagnostic(), krate));
 542
 543     krate = time(time_passes, "maybe building test harness", krate, |krate|
 544                  syntax::test::modify_for_testing(&sess.parse_sess,
 545                                                   &sess.opts.cfg,
 546                                                   krate,
 547                                                   sess.diagnostic()));
 548
 549     krate = time(time_passes, "prelude injection", krate, |krate|
 550                  syntax::std_inject::maybe_inject_prelude(&sess.parse_sess, krate));
 551
 552     time(time_passes, "checking that all macro invocations are gone", &krate, |krate|
 553          syntax::ext::expand::check_for_macros(&sess.parse_sess, krate));
 554
 555     // One final feature gating of the true AST that gets compiled
 556     // later, to make sure we've got everything (e.g. configuration
 557     // can insert new attributes via `cfg_attr`)
 558     time(time_passes, "complete gated feature checking 2", (), |_| {
 559         let features =
 560             syntax::feature_gate::check_crate(sess.codemap(),
 561                                               &sess.parse_sess.span_diagnostic,
 562                                               &krate, &attributes,
 563                                               sess.opts.unstable_features);
 564         *sess.features.borrow_mut() = features;
 565         sess.abort_if_errors();
 566     });
 567
 568     Some(krate)
 569 }
 570
 571 pub fn assign_node_ids_and_map<'ast>(sess: &Session,
 572                                      forest: &'ast mut ast_map::Forest)
 573                                      -> ast_map::Map<'ast> {
 574     struct NodeIdAssigner<'a> {
 575         sess: &'a Session
 576     }
 577
 578     impl<'a> ast_map::FoldOps for NodeIdAssigner<'a> {
 579         fn new_id(&self, old_id: ast::NodeId) -> ast::NodeId {
 580             assert_eq!(old_id, ast::DUMMY_NODE_ID);
 581             self.sess.next_node_id()
 582         }
 583     }
 584
 585     let map = time(sess.time_passes(), "assigning node ids and indexing ast", forest, |forest|
 586                    ast_map::map_crate(forest, NodeIdAssigner { sess: sess }));
 587
 588     if sess.opts.debugging_opts.ast_json {
 589         println!("{}", json::as_json(map.krate()));
 590     }
 591
 592     map
 593 }
 594
 595 /// Run the resolution, typechecking, region checking and other
 596 /// miscellaneous analysis passes on the crate. Return various
 597 /// structures carrying the results of the analysis.
 598 pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: Session,
 599                                                ast_map: ast_map::Map<'tcx>,
 600                                                arenas: &'tcx ty::CtxtArenas<'tcx>,
 601                                                name: String,
 602                                                make_glob_map: resolve::MakeGlobMap,
 603                                                f: F)
 604                                                -> (Session, R)
 605                                                where F: for<'a> FnOnce(&'a ty::ctxt<'tcx>,
 606                                                                ty::CrateAnalysis) -> R
 607 {
 608     let time_passes = sess.time_passes();
 609     let krate = ast_map.krate();
 610
 611     time(time_passes, "external crate/lib resolution", (), |_|
 612          CrateReader::new(&sess).read_crates(krate));
 613
 614     let lang_items = time(time_passes, "language item collection", (), |_|
 615                           middle::lang_items::collect_language_items(krate, &sess));
 616
 617     let resolve::CrateMap {
 618         def_map,
 619         freevars,
 620         export_map,
 621         trait_map,
 622         external_exports,
 623         glob_map,
 624     } =
 625         time(time_passes, "resolution", (),
 626              |_| resolve::resolve_crate(&sess, &ast_map, make_glob_map));
 627
 628     // Discard MTWT tables that aren't required past resolution.
 629     syntax::ext::mtwt::clear_tables();
 630
 631     let named_region_map = time(time_passes, "lifetime resolution", (),
 632                                 |_| middle::resolve_lifetime::krate(&sess, krate, &def_map));
 633
 634     time(time_passes, "looking for entry point", (),
 635          |_| middle::entry::find_entry_point(&sess, &ast_map));
 636
 637     sess.plugin_registrar_fn.set(
 638         time(time_passes, "looking for plugin registrar", (), |_|
 639             plugin::build::find_plugin_registrar(
 640                 sess.diagnostic(), krate)));
 641
 642     let region_map = time(time_passes, "region resolution", (), |_|
 643                           middle::region::resolve_crate(&sess, krate));
 644
 645     time(time_passes, "loop checking", (), |_|
 646          middle::check_loop::check_crate(&sess, krate));
 647
 648     time(time_passes, "static item recursion checking", (), |_|
 649          middle::check_static_recursion::check_crate(&sess, krate, &def_map, &ast_map));
 650
 651     ty::ctxt::create_and_enter(sess,
 652                                arenas,
 653                                def_map,
 654                                named_region_map,
 655                                ast_map,
 656                                freevars,
 657                                region_map,
 658                                lang_items,
 659                                stability::Index::new(krate),
 660                                |tcx| {
 661
 662         // passes are timed inside typeck
 663         typeck::check_crate(tcx, trait_map);
 664
 665         time(time_passes, "const checking", (), |_|
 666             middle::check_const::check_crate(tcx));
 667
 668         let (exported_items, public_items) =
 669                 time(time_passes, "privacy checking", (), |_|
 670                     rustc_privacy::check_crate(tcx, &export_map, external_exports));
 671
 672         // Do not move this check past lint
 673         time(time_passes, "stability index", (), |_|
 674             tcx.stability.borrow_mut().build(tcx, krate, &public_items));
 675
 676         time(time_passes, "intrinsic checking", (), |_|
 677             middle::intrinsicck::check_crate(tcx));
 678
 679         time(time_passes, "effect checking", (), |_|
 680             middle::effect::check_crate(tcx));
 681
 682         time(time_passes, "match checking", (), |_|
 683             middle::check_match::check_crate(tcx));
 684
 685         time(time_passes, "liveness checking", (), |_|
 686             middle::liveness::check_crate(tcx));
 687
 688         time(time_passes, "borrow checking", (), |_|
 689             borrowck::check_crate(tcx));
 690
 691         time(time_passes, "rvalue checking", (), |_|
 692             middle::check_rvalues::check_crate(tcx, krate));
 693
 694         // Avoid overwhelming user with errors if type checking failed.
 695         // I'm not sure how helpful this is, to be honest, but it avoids a
 696         // lot of annoying errors in the compile-fail tests (basically,
 697         // lint warnings and so on -- kindck used to do this abort, but
 698         // kindck is gone now). -nmatsakis
 699         tcx.sess.abort_if_errors();
 700
 701         let reachable_map =
 702             time(time_passes, "reachability checking", (), |_|
 703                 reachable::find_reachable(tcx, &exported_items));
 704
 705         time(time_passes, "death checking", (), |_| {
 706             middle::dead::check_crate(tcx,
 707                                       &exported_items,
 708                                       &reachable_map)
 709         });
 710
 711         let ref lib_features_used =
 712             time(time_passes, "stability checking", (), |_|
 713                 stability::check_unstable_api_usage(tcx));
 714
 715         time(time_passes, "unused lib feature checking", (), |_|
 716             stability::check_unused_or_stable_features(
 717                 &tcx.sess, lib_features_used));
 718
 719         time(time_passes, "lint checking", (), |_|
 720             lint::check_crate(tcx, &exported_items));
 721
 722         // The above three passes generate errors w/o aborting
 723         tcx.sess.abort_if_errors();
 724
 725         f(tcx, ty::CrateAnalysis {
 726             export_map: export_map,
 727             exported_items: exported_items,
 728             public_items: public_items,
 729             reachable: reachable_map,
 730             name: name,
 731             glob_map: glob_map,
 732         })
 733     })
 734 }
 735
 736 /// Run the translation phase to LLVM, after which the AST and analysis can
 737 /// be discarded.
 738 pub fn phase_4_translate_to_llvm(tcx: &ty::ctxt, analysis: ty::CrateAnalysis)
 739                                  -> trans::CrateTranslation {
 740     let time_passes = tcx.sess.time_passes();
 741
 742     time(time_passes, "resolving dependency formats", (), |_|
 743          dependency_format::calculate(tcx));
 744
 745     // Option dance to work around the lack of stack once closures.
 746     time(time_passes, "translation", analysis, |analysis|
 747          trans::trans_crate(tcx, analysis))
 748 }
 749
 750 /// Run LLVM itself, producing a bitcode file, assembly file or object file
 751 /// as a side effect.
 752 pub fn phase_5_run_llvm_passes(sess: &Session,
 753                                trans: &trans::CrateTranslation,
 754                                outputs: &OutputFilenames) {
 755     if sess.opts.cg.no_integrated_as {
 756         let output_type = config::OutputTypeAssembly;
 757
 758         time(sess.time_passes(), "LLVM passes", (), |_|
 759             write::run_passes(sess, trans, &[output_type], outputs));
 760
 761         write::run_assembler(sess, outputs);
 762
 763         // Remove assembly source, unless --save-temps was specified
 764         if !sess.opts.cg.save_temps {
 765             fs::remove_file(&outputs.temp_path(config::OutputTypeAssembly)).unwrap();
 766         }
 767     } else {
 768         time(sess.time_passes(), "LLVM passes", (), |_|
 769             write::run_passes(sess,
 770                               trans,
 771                               &sess.opts.output_types,
 772                               outputs));
 773     }
 774
 775     sess.abort_if_errors();
 776 }
 777
 778 /// Run the linker on any artifacts that resulted from the LLVM run.
 779 /// This should produce either a finished executable or library.
 780 pub fn phase_6_link_output(sess: &Session,
 781                            trans: &trans::CrateTranslation,
 782                            outputs: &OutputFilenames) {
 783     time(sess.time_passes(), "linking", (), |_|
 784          link::link_binary(sess,
 785                            trans,
 786                            outputs,
 787                            &trans.link.crate_name));
 788 }
 789
 790 fn escape_dep_filename(filename: &str) -> String {
 791     // Apparently clang and gcc *only* escape spaces:
 792     // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
 793     filename.replace(" ", "\\ ")
 794 }
 795
 796 fn write_out_deps(sess: &Session,
 797                   input: &Input,
 798                   outputs: &OutputFilenames,
 799                   id: &str) {
 800
 801     let mut out_filenames = Vec::new();
 802     for output_type in &sess.opts.output_types {
 803         let file = outputs.path(*output_type);
 804         match *output_type {
 805             config::OutputTypeExe => {
 806                 for output in sess.crate_types.borrow().iter() {
 807                     let p = link::filename_for_input(sess, *output, id,
 808                                                      outputs);
 809                     out_filenames.push(p);
 810                 }
 811             }
 812             _ => { out_filenames.push(file); }
 813         }
 814     }
 815
 816     // Write out dependency rules to the dep-info file if requested with
 817     // --dep-info
 818     let deps_filename = match sess.opts.write_dependency_info {
 819         // Use filename from --dep-file argument if given
 820         (true, Some(ref filename)) => filename.clone(),
 821         // Use default filename: crate source filename with extension replaced
 822         // by ".d"
 823         (true, None) => match *input {
 824             Input::File(..) => outputs.with_extension("d"),
 825             Input::Str(..) => {
 826                 sess.warn("can not write --dep-info without a filename \
 827                            when compiling stdin.");
 828                 return
 829             },
 830         },
 831         _ => return,
 832     };
 833
 834     let result = (|| -> io::Result<()> {
 835         // Build a list of files used to compile the output and
 836         // write Makefile-compatible dependency rules
 837         let files: Vec<String> = sess.codemap().files.borrow()
 838                                    .iter()
 839                                    .filter(|fmap| fmap.is_real_file())
 840                                    .filter(|fmap| !fmap.is_imported())
 841                                    .map(|fmap| escape_dep_filename(&fmap.name))
 842                                    .collect();
 843         let mut file = try!(fs::File::create(&deps_filename));
 844         for path in &out_filenames {
 845             try!(write!(&mut file,
 846                         "{}: {}\n\n", path.display(), files.join(" ")));
 847         }
 848         Ok(())
 849     })();
 850
 851     match result {
 852         Ok(()) => {}
 853         Err(e) => {
 854             sess.fatal(&format!("error writing dependencies to `{}`: {}",
 855                                deps_filename.display(), e));
 856         }
 857     }
 858 }
 859
 860 pub fn collect_crate_types(session: &Session,
 861                            attrs: &[ast::Attribute]) -> Vec<config::CrateType> {
 862     // Unconditionally collect crate types from attributes to make them used
 863     let attr_types: Vec<config::CrateType> = attrs.iter().filter_map(|a| {
 864         if a.check_name("crate_type") {
 865             match a.value_str() {
 866                 Some(ref n) if *n == "rlib" => {
 867                     Some(config::CrateTypeRlib)
 868                 }
 869                 Some(ref n) if *n == "dylib" => {
 870                     Some(config::CrateTypeDylib)
 871                 }
 872                 Some(ref n) if *n == "lib" => {
 873                     Some(config::default_lib_output())
 874                 }
 875                 Some(ref n) if *n == "staticlib" => {
 876                     Some(config::CrateTypeStaticlib)
 877                 }
 878                 Some(ref n) if *n == "bin" => Some(config::CrateTypeExecutable),
 879                 Some(_) => {
 880                     session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
 881                                      ast::CRATE_NODE_ID,
 882                                      a.span,
 883                                      "invalid `crate_type` \
 884                                       value".to_string());
 885                     None
 886                 }
 887                 _ => {
 888                     session.span_err(a.span, "`crate_type` requires a value");
 889                     session.note("for example: `#![crate_type=\"lib\"]`");
 890                     None
 891                 }
 892             }
 893         } else {
 894             None
 895         }
 896     }).collect();
 897
 898     // If we're generating a test executable, then ignore all other output
 899     // styles at all other locations
 900     if session.opts.test {
 901         return vec!(config::CrateTypeExecutable)
 902     }
 903
 904     // Only check command line flags if present. If no types are specified by
 905     // command line, then reuse the empty `base` Vec to hold the types that
 906     // will be found in crate attributes.
 907     let mut base = session.opts.crate_types.clone();
 908     if base.is_empty() {
 909         base.extend(attr_types);
 910         if base.is_empty() {
 911             base.push(link::default_output_for_target(session));
 912         }
 913         base.sort();
 914         base.dedup();
 915     }
 916
 917     base.into_iter().filter(|crate_type| {
 918         let res = !link::invalid_output_for_target(session, *crate_type);
 919
 920         if !res {
 921             session.warn(&format!("dropping unsupported crate type `{}` \
 922                                    for target `{}`",
 923                                  *crate_type, session.opts.target_triple));
 924         }
 925
 926         res
 927     }).collect()
 928 }
 929
 930 pub fn collect_crate_metadata(session: &Session,
 931                               _attrs: &[ast::Attribute]) -> Vec<String> {
 932     session.opts.cg.metadata.clone()
 933 }
 934
 935 pub fn build_output_filenames(input: &Input,
 936                               odir: &Option<PathBuf>,
 937                               ofile: &Option<PathBuf>,
 938                               attrs: &[ast::Attribute],
 939                               sess: &Session)
 940                            -> OutputFilenames {
 941     match *ofile {
 942         None => {
 943             // "-" as input file will cause the parser to read from stdin so we
 944             // have to make up a name
 945             // We want to toss everything after the final '.'
 946             let dirpath = match *odir {
 947                 Some(ref d) => d.clone(),
 948                 None => PathBuf::new()
 949             };
 950
 951             // If a crate name is present, we use it as the link name
 952             let stem = sess.opts.crate_name.clone().or_else(|| {
 953                 attr::find_crate_name(attrs).map(|n| n.to_string())
 954             }).unwrap_or(input.filestem());
 955
 956             OutputFilenames {
 957                 out_directory: dirpath,
 958                 out_filestem: stem,
 959                 single_output_file: None,
 960                 extra: sess.opts.cg.extra_filename.clone(),
 961             }
 962         }
 963
 964         Some(ref out_file) => {
 965             let ofile = if sess.opts.output_types.len() > 1 {
 966                 sess.warn("ignoring specified output filename because multiple \
 967                            outputs were requested");
 968                 None
 969             } else {
 970                 Some(out_file.clone())
 971             };
 972             if *odir != None {
 973                 sess.warn("ignoring --out-dir flag due to -o flag.");
 974             }
 975
 976             let cur_dir = Path::new("");
 977
 978             OutputFilenames {
 979                 out_directory: out_file.parent().unwrap_or(cur_dir).to_path_buf(),
 980                 out_filestem: out_file.file_stem().unwrap_or(OsStr::new(""))
 981                                       .to_str().unwrap().to_string(),
 982                 single_output_file: ofile,
 983                 extra: sess.opts.cg.extra_filename.clone(),
 984             }
 985         }
 986     }
 987 }