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::front;
  12 use rustc::front::map as hir_map;
  13 use rustc_mir as mir;
  14 use rustc_mir::mir_map::MirMap;
  15 use rustc::session::Session;
  16 use rustc::session::config::{self, Input, OutputFilenames, OutputType};
  17 use rustc::session::search_paths::PathKind;
  18 use rustc::lint;
  19 use rustc::middle::{stability, ty, reachable};
  20 use rustc::middle::dependency_format;
  21 use rustc::middle;
  22 use rustc::util::common::time;
  23 use rustc_borrowck as borrowck;
  24 use rustc_resolve as resolve;
  25 use rustc_metadata::macro_import;
  26 use rustc_metadata::creader::LocalCrateReader;
  27 use rustc_metadata::cstore::CStore;
  28 use rustc_trans::back::link;
  29 use rustc_trans::back::write;
  30 use rustc_trans::trans;
  31 use rustc_typeck as typeck;
  32 use rustc_privacy;
  33 use rustc_plugin::registry::Registry;
  34 use rustc_plugin as plugin;
  35 use rustc_front::hir;
  36 use rustc_front::lowering::{lower_crate, LoweringContext};
  37 use super::Compilation;
  38
  39 use serialize::json;
  40
  41 use std::collections::HashMap;
  42 use std::env;
  43 use std::ffi::{OsString, OsStr};
  44 use std::fs;
  45 use std::io::{self, Write};
  46 use std::path::{Path, PathBuf};
  47 use syntax::ast::{self, NodeIdAssigner};
  48 use syntax::attr;
  49 use syntax::attr::AttrMetaMethods;
  50 use syntax::diagnostics;
  51 use syntax::fold::Folder;
  52 use syntax::parse;
  53 use syntax::parse::token;
  54 use syntax::util::node_count::NodeCounter;
  55 use syntax::visit;
  56 use syntax;
  57 use syntax_ext;
  58
  59 pub fn compile_input(sess: Session,
  60                      cstore: &CStore,
  61                      cfg: ast::CrateConfig,
  62                      input: &Input,
  63                      outdir: &Option<PathBuf>,
  64                      output: &Option<PathBuf>,
  65                      addl_plugins: Option<Vec<String>>,
  66                      control: CompileController) {
  67     macro_rules! controller_entry_point{($point: ident, $tsess: expr, $make_state: expr) => ({
  68         let state = $make_state;
  69         (control.$point.callback)(state);
  70
  71         $tsess.abort_if_errors();
  72         if control.$point.stop == Compilation::Stop {
  73             return;
  74         }
  75     })}
  76
  77     // We need nested scopes here, because the intermediate results can keep
  78     // large chunks of memory alive and we want to free them as soon as
  79     // possible to keep the peak memory usage low
  80     let result = {
  81         let (outputs, expanded_crate, id) = {
  82             let krate = phase_1_parse_input(&sess, cfg, input);
  83
  84             controller_entry_point!(after_parse,
  85                                     sess,
  86                                     CompileState::state_after_parse(input, &sess, outdir, &krate));
  87
  88             let outputs = build_output_filenames(input, outdir, output, &krate.attrs, &sess);
  89             let id = link::find_crate_name(Some(&sess), &krate.attrs, input);
  90             let expanded_crate = match phase_2_configure_and_expand(&sess,
  91                                                                     &cstore,
  92                                                                     krate,
  93                                                                     &id[..],
  94                                                                     addl_plugins) {
  95                 None => return,
  96                 Some(k) => k,
  97             };
  98
  99             (outputs, expanded_crate, id)
 100         };
 101
 102         controller_entry_point!(after_expand,
 103                                 sess,
 104                                 CompileState::state_after_expand(input,
 105                                                                  &sess,
 106                                                                  outdir,
 107                                                                  &expanded_crate,
 108                                                                  &id[..]));
 109
 110         let expanded_crate = assign_node_ids(&sess, expanded_crate);
 111         // Lower ast -> hir.
 112         let lcx = LoweringContext::new(&sess, Some(&expanded_crate));
 113         let mut hir_forest = time(sess.time_passes(),
 114                                   "lowering ast -> hir",
 115                                   || hir_map::Forest::new(lower_crate(&lcx, &expanded_crate)));
 116
 117         // Discard MTWT tables that aren't required past lowering to HIR.
 118         if !sess.opts.debugging_opts.keep_mtwt_tables &&
 119            !sess.opts.debugging_opts.save_analysis {
 120             syntax::ext::mtwt::clear_tables();
 121         }
 122
 123         let arenas = ty::CtxtArenas::new();
 124         let hir_map = make_map(&sess, &mut hir_forest);
 125
 126         write_out_deps(&sess, &outputs, &id);
 127
 128         controller_entry_point!(after_write_deps,
 129                                 sess,
 130                                 CompileState::state_after_write_deps(input,
 131                                                                      &sess,
 132                                                                      outdir,
 133                                                                      &hir_map,
 134                                                                      &expanded_crate,
 135                                                                      &hir_map.krate(),
 136                                                                      &id[..],
 137                                                                      &lcx));
 138
 139         time(sess.time_passes(), "attribute checking", || {
 140             front::check_attr::check_crate(&sess, &expanded_crate);
 141         });
 142
 143         time(sess.time_passes(),
 144              "early lint checks",
 145              || lint::check_ast_crate(&sess, &expanded_crate));
 146
 147         let opt_crate = if sess.opts.debugging_opts.keep_ast ||
 148                            sess.opts.debugging_opts.save_analysis {
 149             Some(&expanded_crate)
 150         } else {
 151             drop(expanded_crate);
 152             None
 153         };
 154
 155         phase_3_run_analysis_passes(&sess,
 156                                     &cstore,
 157                                     hir_map,
 158                                     &arenas,
 159                                     &id,
 160                                     control.make_glob_map,
 161                                     |tcx, mir_map, analysis| {
 162
 163                                         {
 164                                             let state =
 165                                                 CompileState::state_after_analysis(input,
 166                                                                                    &tcx.sess,
 167                                                                                    outdir,
 168                                                                                    opt_crate,
 169                                                                                    tcx.map.krate(),
 170                                                                                    &analysis,
 171                                                                                    &mir_map,
 172                                                                                    tcx,
 173                                                                                    &lcx,
 174                                                                                    &id);
 175                                             (control.after_analysis.callback)(state);
 176
 177                                             tcx.sess.abort_if_errors();
 178                                             if control.after_analysis.stop == Compilation::Stop {
 179                                                 return Err(());
 180                                             }
 181                                         }
 182
 183                                         if log_enabled!(::log::INFO) {
 184                                             println!("Pre-trans");
 185                                             tcx.print_debug_stats();
 186                                         }
 187                                         let trans = phase_4_translate_to_llvm(tcx,
 188                                                                               mir_map,
 189                                                                               analysis);
 190
 191                                         if log_enabled!(::log::INFO) {
 192                                             println!("Post-trans");
 193                                             tcx.print_debug_stats();
 194                                         }
 195
 196                                         // Discard interned strings as they are no longer required.
 197                                         token::get_ident_interner().clear();
 198
 199                                         Ok((outputs, trans))
 200                                     })
 201     };
 202
 203     let (outputs, trans) = if let Ok(out) = result {
 204         out
 205     } else {
 206         return;
 207     };
 208
 209     phase_5_run_llvm_passes(&sess, &trans, &outputs);
 210
 211     controller_entry_point!(after_llvm,
 212                             sess,
 213                             CompileState::state_after_llvm(input, &sess, outdir, &trans));
 214
 215     phase_6_link_output(&sess, &trans, &outputs);
 216 }
 217
 218 /// The name used for source code that doesn't originate in a file
 219 /// (e.g. source from stdin or a string)
 220 pub fn anon_src() -> String {
 221     "<anon>".to_string()
 222 }
 223
 224 pub fn source_name(input: &Input) -> String {
 225     match *input {
 226         // FIXME (#9639): This needs to handle non-utf8 paths
 227         Input::File(ref ifile) => ifile.to_str().unwrap().to_string(),
 228         Input::Str(_) => anon_src(),
 229     }
 230 }
 231
 232 /// CompileController is used to customise compilation, it allows compilation to
 233 /// be stopped and/or to call arbitrary code at various points in compilation.
 234 /// It also allows for various flags to be set to influence what information gets
 235 /// collected during compilation.
 236 ///
 237 /// This is a somewhat higher level controller than a Session - the Session
 238 /// controls what happens in each phase, whereas the CompileController controls
 239 /// whether a phase is run at all and whether other code (from outside the
 240 /// the compiler) is run between phases.
 241 ///
 242 /// Note that if compilation is set to stop and a callback is provided for a
 243 /// given entry point, the callback is called before compilation is stopped.
 244 ///
 245 /// Expect more entry points to be added in the future.
 246 pub struct CompileController<'a> {
 247     pub after_parse: PhaseController<'a>,
 248     pub after_expand: PhaseController<'a>,
 249     pub after_write_deps: PhaseController<'a>,
 250     pub after_analysis: PhaseController<'a>,
 251     pub after_llvm: PhaseController<'a>,
 252
 253     pub make_glob_map: resolve::MakeGlobMap,
 254 }
 255
 256 impl<'a> CompileController<'a> {
 257     pub fn basic() -> CompileController<'a> {
 258         CompileController {
 259             after_parse: PhaseController::basic(),
 260             after_expand: PhaseController::basic(),
 261             after_write_deps: PhaseController::basic(),
 262             after_analysis: PhaseController::basic(),
 263             after_llvm: PhaseController::basic(),
 264             make_glob_map: resolve::MakeGlobMap::No,
 265         }
 266     }
 267 }
 268
 269 pub struct PhaseController<'a> {
 270     pub stop: Compilation,
 271     pub callback: Box<Fn(CompileState) -> () + 'a>,
 272 }
 273
 274 impl<'a> PhaseController<'a> {
 275     pub fn basic() -> PhaseController<'a> {
 276         PhaseController {
 277             stop: Compilation::Continue,
 278             callback: box |_| {},
 279         }
 280     }
 281 }
 282
 283 /// State that is passed to a callback. What state is available depends on when
 284 /// during compilation the callback is made. See the various constructor methods
 285 /// (`state_*`) in the impl to see which data is provided for any given entry point.
 286 pub struct CompileState<'a, 'ast: 'a, 'tcx: 'a> {
 287     pub input: &'a Input,
 288     pub session: &'a Session,
 289     pub cfg: Option<&'a ast::CrateConfig>,
 290     pub krate: Option<&'a ast::Crate>,
 291     pub crate_name: Option<&'a str>,
 292     pub output_filenames: Option<&'a OutputFilenames>,
 293     pub out_dir: Option<&'a Path>,
 294     pub expanded_crate: Option<&'a ast::Crate>,
 295     pub hir_crate: Option<&'a hir::Crate>,
 296     pub ast_map: Option<&'a hir_map::Map<'ast>>,
 297     pub mir_map: Option<&'a MirMap<'tcx>>,
 298     pub analysis: Option<&'a ty::CrateAnalysis<'a>>,
 299     pub tcx: Option<&'a ty::ctxt<'tcx>>,
 300     pub lcx: Option<&'a LoweringContext<'a>>,
 301     pub trans: Option<&'a trans::CrateTranslation>,
 302 }
 303
 304 impl<'a, 'ast, 'tcx> CompileState<'a, 'ast, 'tcx> {
 305     fn empty(input: &'a Input,
 306              session: &'a Session,
 307              out_dir: &'a Option<PathBuf>)
 308              -> CompileState<'a, 'ast, 'tcx> {
 309         CompileState {
 310             input: input,
 311             session: session,
 312             out_dir: out_dir.as_ref().map(|s| &**s),
 313             cfg: None,
 314             krate: None,
 315             crate_name: None,
 316             output_filenames: None,
 317             expanded_crate: None,
 318             hir_crate: None,
 319             ast_map: None,
 320             analysis: None,
 321             mir_map: None,
 322             tcx: None,
 323             lcx: None,
 324             trans: None,
 325         }
 326     }
 327
 328     fn state_after_parse(input: &'a Input,
 329                          session: &'a Session,
 330                          out_dir: &'a Option<PathBuf>,
 331                          krate: &'a ast::Crate)
 332                          -> CompileState<'a, 'ast, 'tcx> {
 333         CompileState { krate: Some(krate), ..CompileState::empty(input, session, out_dir) }
 334     }
 335
 336     fn state_after_expand(input: &'a Input,
 337                           session: &'a Session,
 338                           out_dir: &'a Option<PathBuf>,
 339                           expanded_crate: &'a ast::Crate,
 340                           crate_name: &'a str)
 341                           -> CompileState<'a, 'ast, 'tcx> {
 342         CompileState {
 343             crate_name: Some(crate_name),
 344             expanded_crate: Some(expanded_crate),
 345             ..CompileState::empty(input, session, out_dir)
 346         }
 347     }
 348
 349     fn state_after_write_deps(input: &'a Input,
 350                               session: &'a Session,
 351                               out_dir: &'a Option<PathBuf>,
 352                               hir_map: &'a hir_map::Map<'ast>,
 353                               krate: &'a ast::Crate,
 354                               hir_crate: &'a hir::Crate,
 355                               crate_name: &'a str,
 356                               lcx: &'a LoweringContext<'a>)
 357                               -> CompileState<'a, 'ast, 'tcx> {
 358         CompileState {
 359             crate_name: Some(crate_name),
 360             ast_map: Some(hir_map),
 361             krate: Some(krate),
 362             hir_crate: Some(hir_crate),
 363             lcx: Some(lcx),
 364             ..CompileState::empty(input, session, out_dir)
 365         }
 366     }
 367
 368     fn state_after_analysis(input: &'a Input,
 369                             session: &'a Session,
 370                             out_dir: &'a Option<PathBuf>,
 371                             krate: Option<&'a ast::Crate>,
 372                             hir_crate: &'a hir::Crate,
 373                             analysis: &'a ty::CrateAnalysis,
 374                             mir_map: &'a MirMap<'tcx>,
 375                             tcx: &'a ty::ctxt<'tcx>,
 376                             lcx: &'a LoweringContext<'a>,
 377                             crate_name: &'a str)
 378                             -> CompileState<'a, 'ast, 'tcx> {
 379         CompileState {
 380             analysis: Some(analysis),
 381             mir_map: Some(mir_map),
 382             tcx: Some(tcx),
 383             krate: krate,
 384             hir_crate: Some(hir_crate),
 385             lcx: Some(lcx),
 386             crate_name: Some(crate_name),
 387             ..CompileState::empty(input, session, out_dir)
 388         }
 389     }
 390
 391
 392     fn state_after_llvm(input: &'a Input,
 393                         session: &'a Session,
 394                         out_dir: &'a Option<PathBuf>,
 395                         trans: &'a trans::CrateTranslation)
 396                         -> CompileState<'a, 'ast, 'tcx> {
 397         CompileState { trans: Some(trans), ..CompileState::empty(input, session, out_dir) }
 398     }
 399 }
 400
 401 pub fn phase_1_parse_input(sess: &Session, cfg: ast::CrateConfig, input: &Input) -> ast::Crate {
 402     // These may be left in an incoherent state after a previous compile.
 403     // `clear_tables` and `get_ident_interner().clear()` can be used to free
 404     // memory, but they do not restore the initial state.
 405     syntax::ext::mtwt::reset_tables();
 406     token::reset_ident_interner();
 407
 408     let krate = time(sess.time_passes(), "parsing", || {
 409         match *input {
 410             Input::File(ref file) => {
 411                 parse::parse_crate_from_file(&(*file), cfg.clone(), &sess.parse_sess)
 412             }
 413             Input::Str(ref src) => {
 414                 parse::parse_crate_from_source_str(anon_src().to_string(),
 415                                                    src.to_string(),
 416                                                    cfg.clone(),
 417                                                    &sess.parse_sess)
 418             }
 419         }
 420     });
 421
 422     if sess.opts.debugging_opts.ast_json_noexpand {
 423         println!("{}", json::as_json(&krate));
 424     }
 425
 426     if sess.opts.debugging_opts.input_stats {
 427         println!("Lines of code:             {}", sess.codemap().count_lines());
 428         println!("Pre-expansion node count:  {}", count_nodes(&krate));
 429     }
 430
 431     if let Some(ref s) = sess.opts.debugging_opts.show_span {
 432         syntax::show_span::run(sess.diagnostic(), s, &krate);
 433     }
 434
 435     krate
 436 }
 437
 438 fn count_nodes(krate: &ast::Crate) -> usize {
 439     let mut counter = NodeCounter::new();
 440     visit::walk_crate(&mut counter, krate);
 441     counter.count
 442 }
 443
 444 // For continuing compilation after a parsed crate has been
 445 // modified
 446
 447 /// Run the "early phases" of the compiler: initial `cfg` processing,
 448 /// loading compiler plugins (including those from `addl_plugins`),
 449 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
 450 /// harness if one is to be provided and injection of a dependency on the
 451 /// standard library and prelude.
 452 ///
 453 /// Returns `None` if we're aborting after handling -W help.
 454 pub fn phase_2_configure_and_expand(sess: &Session,
 455                                     cstore: &CStore,
 456                                     mut krate: ast::Crate,
 457                                     crate_name: &str,
 458                                     addl_plugins: Option<Vec<String>>)
 459                                     -> Option<ast::Crate> {
 460     let time_passes = sess.time_passes();
 461
 462     // strip before anything else because crate metadata may use #[cfg_attr]
 463     // and so macros can depend on configuration variables, such as
 464     //
 465     //   #[macro_use] #[cfg(foo)]
 466     //   mod bar { macro_rules! baz!(() => {{}}) }
 467     //
 468     // baz! should not use this definition unless foo is enabled.
 469
 470     let mut feature_gated_cfgs = vec![];
 471     krate = time(time_passes, "configuration 1", || {
 472         syntax::config::strip_unconfigured_items(sess.diagnostic(), krate, &mut feature_gated_cfgs)
 473     });
 474
 475     *sess.crate_types.borrow_mut() = collect_crate_types(sess, &krate.attrs);
 476     *sess.crate_metadata.borrow_mut() = collect_crate_metadata(sess, &krate.attrs);
 477
 478     time(time_passes, "recursion limit", || {
 479         middle::recursion_limit::update_recursion_limit(sess, &krate);
 480     });
 481
 482     time(time_passes, "gated macro checking", || {
 483         let features = syntax::feature_gate::check_crate_macros(sess.codemap(),
 484                                                                 &sess.parse_sess.span_diagnostic,
 485                                                                 &krate);
 486
 487         // these need to be set "early" so that expansion sees `quote` if enabled.
 488         *sess.features.borrow_mut() = features;
 489         sess.abort_if_errors();
 490     });
 491
 492
 493     krate = time(time_passes, "crate injection", || {
 494         syntax::std_inject::maybe_inject_crates_ref(krate, sess.opts.alt_std_name.clone())
 495     });
 496
 497     let macros = time(time_passes,
 498                       "macro loading",
 499                       || macro_import::read_macro_defs(sess, &cstore, &krate));
 500
 501     let mut addl_plugins = Some(addl_plugins);
 502     let registrars = time(time_passes, "plugin loading", || {
 503         plugin::load::load_plugins(sess, &cstore, &krate, addl_plugins.take().unwrap())
 504     });
 505
 506     let mut registry = Registry::new(sess, &krate);
 507
 508     time(time_passes, "plugin registration", || {
 509         if sess.features.borrow().rustc_diagnostic_macros {
 510             registry.register_macro("__diagnostic_used",
 511                                     diagnostics::plugin::expand_diagnostic_used);
 512             registry.register_macro("__register_diagnostic",
 513                                     diagnostics::plugin::expand_register_diagnostic);
 514             registry.register_macro("__build_diagnostic_array",
 515                                     diagnostics::plugin::expand_build_diagnostic_array);
 516         }
 517
 518         for registrar in registrars {
 519             registry.args_hidden = Some(registrar.args);
 520             (registrar.fun)(&mut registry);
 521         }
 522     });
 523
 524     let Registry { syntax_exts, early_lint_passes, late_lint_passes, lint_groups,
 525                    llvm_passes, attributes, .. } = registry;
 526
 527     {
 528         let mut ls = sess.lint_store.borrow_mut();
 529         for pass in early_lint_passes {
 530             ls.register_early_pass(Some(sess), true, pass);
 531         }
 532         for pass in late_lint_passes {
 533             ls.register_late_pass(Some(sess), true, pass);
 534         }
 535
 536         for (name, to) in lint_groups {
 537             ls.register_group(Some(sess), true, name, to);
 538         }
 539
 540         *sess.plugin_llvm_passes.borrow_mut() = llvm_passes;
 541         *sess.plugin_attributes.borrow_mut() = attributes.clone();
 542     }
 543
 544     // Lint plugins are registered; now we can process command line flags.
 545     if sess.opts.describe_lints {
 546         super::describe_lints(&*sess.lint_store.borrow(), true);
 547         return None;
 548     }
 549     sess.lint_store.borrow_mut().process_command_line(sess);
 550
 551     // Abort if there are errors from lint processing or a plugin registrar.
 552     sess.abort_if_errors();
 553
 554     krate = time(time_passes, "expansion", || {
 555         // Windows dlls do not have rpaths, so they don't know how to find their
 556         // dependencies. It's up to us to tell the system where to find all the
 557         // dependent dlls. Note that this uses cfg!(windows) as opposed to
 558         // targ_cfg because syntax extensions are always loaded for the host
 559         // compiler, not for the target.
 560         let mut _old_path = OsString::new();
 561         if cfg!(windows) {
 562             _old_path = env::var_os("PATH").unwrap_or(_old_path);
 563             let mut new_path = sess.host_filesearch(PathKind::All)
 564                                    .get_dylib_search_paths();
 565             new_path.extend(env::split_paths(&_old_path));
 566             env::set_var("PATH", &env::join_paths(new_path).unwrap());
 567         }
 568         let features = sess.features.borrow();
 569         let cfg = syntax::ext::expand::ExpansionConfig {
 570             crate_name: crate_name.to_string(),
 571             features: Some(&features),
 572             recursion_limit: sess.recursion_limit.get(),
 573             trace_mac: sess.opts.debugging_opts.trace_macros,
 574         };
 575         let mut ecx = syntax::ext::base::ExtCtxt::new(&sess.parse_sess,
 576                                                       krate.config.clone(),
 577                                                       cfg,
 578                                                       &mut feature_gated_cfgs);
 579         syntax_ext::register_builtins(&mut ecx.syntax_env);
 580         let (ret, macro_names) = syntax::ext::expand::expand_crate(ecx,
 581                                                                    macros,
 582                                                                    syntax_exts,
 583                                                                    krate);
 584         if cfg!(windows) {
 585             env::set_var("PATH", &_old_path);
 586         }
 587         *sess.available_macros.borrow_mut() = macro_names;
 588         ret
 589     });
 590
 591     // Needs to go *after* expansion to be able to check the results
 592     // of macro expansion.  This runs before #[cfg] to try to catch as
 593     // much as possible (e.g. help the programmer avoid platform
 594     // specific differences)
 595     time(time_passes, "complete gated feature checking 1", || {
 596         let features = syntax::feature_gate::check_crate(sess.codemap(),
 597                                                          &sess.parse_sess.span_diagnostic,
 598                                                          &krate,
 599                                                          &attributes,
 600                                                          sess.opts.unstable_features);
 601         *sess.features.borrow_mut() = features;
 602         sess.abort_if_errors();
 603     });
 604
 605     // JBC: make CFG processing part of expansion to avoid this problem:
 606
 607     // strip again, in case expansion added anything with a #[cfg].
 608     krate = time(time_passes, "configuration 2", || {
 609         syntax::config::strip_unconfigured_items(sess.diagnostic(), krate, &mut feature_gated_cfgs)
 610     });
 611
 612     time(time_passes, "gated configuration checking", || {
 613         let features = sess.features.borrow();
 614         feature_gated_cfgs.sort();
 615         feature_gated_cfgs.dedup();
 616         for cfg in &feature_gated_cfgs {
 617             cfg.check_and_emit(sess.diagnostic(), &features, sess.codemap());
 618         }
 619     });
 620
 621     krate = time(time_passes, "maybe building test harness", || {
 622         syntax::test::modify_for_testing(&sess.parse_sess, &sess.opts.cfg, krate, sess.diagnostic())
 623     });
 624
 625     krate = time(time_passes,
 626                  "prelude injection",
 627                  || syntax::std_inject::maybe_inject_prelude(&sess.parse_sess, krate));
 628
 629     time(time_passes,
 630          "checking that all macro invocations are gone",
 631          || syntax::ext::expand::check_for_macros(&sess.parse_sess, &krate));
 632
 633     time(time_passes,
 634          "checking for inline asm in case the target doesn't support it",
 635          || ::rustc_passes::no_asm::check_crate(sess, &krate));
 636
 637     // One final feature gating of the true AST that gets compiled
 638     // later, to make sure we've got everything (e.g. configuration
 639     // can insert new attributes via `cfg_attr`)
 640     time(time_passes, "complete gated feature checking 2", || {
 641         let features = syntax::feature_gate::check_crate(sess.codemap(),
 642                                                          &sess.parse_sess.span_diagnostic,
 643                                                          &krate,
 644                                                          &attributes,
 645                                                          sess.opts.unstable_features);
 646         *sess.features.borrow_mut() = features;
 647         sess.abort_if_errors();
 648     });
 649
 650     time(time_passes,
 651          "const fn bodies and arguments",
 652          || ::rustc_passes::const_fn::check_crate(sess, &krate));
 653
 654     if sess.opts.debugging_opts.input_stats {
 655         println!("Post-expansion node count: {}", count_nodes(&krate));
 656     }
 657
 658     Some(krate)
 659 }
 660
 661 pub fn assign_node_ids(sess: &Session, krate: ast::Crate) -> ast::Crate {
 662     struct NodeIdAssigner<'a> {
 663         sess: &'a Session,
 664     }
 665
 666     impl<'a> Folder for NodeIdAssigner<'a> {
 667         fn new_id(&mut self, old_id: ast::NodeId) -> ast::NodeId {
 668             assert_eq!(old_id, ast::DUMMY_NODE_ID);
 669             self.sess.next_node_id()
 670         }
 671     }
 672
 673     let krate = time(sess.time_passes(),
 674                      "assigning node ids",
 675                      || NodeIdAssigner { sess: sess }.fold_crate(krate));
 676
 677     if sess.opts.debugging_opts.ast_json {
 678         println!("{}", json::as_json(&krate));
 679     }
 680
 681     krate
 682 }
 683
 684 pub fn make_map<'ast>(sess: &Session,
 685                       forest: &'ast mut hir_map::Forest)
 686                       -> hir_map::Map<'ast> {
 687     // Construct the HIR map
 688     time(sess.time_passes(),
 689          "indexing hir",
 690          move || hir_map::map_crate(forest))
 691 }
 692
 693 /// Run the resolution, typechecking, region checking and other
 694 /// miscellaneous analysis passes on the crate. Return various
 695 /// structures carrying the results of the analysis.
 696 pub fn phase_3_run_analysis_passes<'tcx, F, R>(sess: &'tcx Session,
 697                                                cstore: &CStore,
 698                                                hir_map: hir_map::Map<'tcx>,
 699                                                arenas: &'tcx ty::CtxtArenas<'tcx>,
 700                                                name: &str,
 701                                                make_glob_map: resolve::MakeGlobMap,
 702                                                f: F)
 703                                                -> R
 704     where F: for<'a> FnOnce(&'a ty::ctxt<'tcx>, MirMap<'tcx>, ty::CrateAnalysis) -> R
 705 {
 706     let time_passes = sess.time_passes();
 707     let krate = hir_map.krate();
 708
 709     time(time_passes,
 710          "external crate/lib resolution",
 711          || LocalCrateReader::new(sess, cstore, &hir_map).read_crates(krate));
 712
 713     let lang_items = time(time_passes,
 714                           "language item collection",
 715                           || middle::lang_items::collect_language_items(&sess, &hir_map));
 716
 717     let resolve::CrateMap {
 718         def_map,
 719         freevars,
 720         export_map,
 721         trait_map,
 722         external_exports,
 723         glob_map,
 724     } = time(time_passes,
 725              "resolution",
 726              || resolve::resolve_crate(sess, &hir_map, make_glob_map));
 727
 728     let named_region_map = time(time_passes,
 729                                 "lifetime resolution",
 730                                 || middle::resolve_lifetime::krate(sess, krate, &def_map.borrow()));
 731
 732     time(time_passes,
 733          "looking for entry point",
 734          || middle::entry::find_entry_point(sess, &hir_map));
 735
 736     sess.plugin_registrar_fn.set(time(time_passes, "looking for plugin registrar", || {
 737         plugin::build::find_plugin_registrar(sess.diagnostic(), krate)
 738     }));
 739
 740     let region_map = time(time_passes,
 741                           "region resolution",
 742                           || middle::region::resolve_crate(sess, krate));
 743
 744     time(time_passes,
 745          "loop checking",
 746          || middle::check_loop::check_crate(sess, krate));
 747
 748     time(time_passes,
 749          "static item recursion checking",
 750          || middle::check_static_recursion::check_crate(sess, krate, &def_map.borrow(), &hir_map));
 751
 752     ty::ctxt::create_and_enter(sess,
 753                                arenas,
 754                                def_map,
 755                                named_region_map,
 756                                hir_map,
 757                                freevars,
 758                                region_map,
 759                                lang_items,
 760                                stability::Index::new(krate),
 761                                |tcx| {
 762                                    // passes are timed inside typeck
 763                                    typeck::check_crate(tcx, trait_map);
 764
 765                                    time(time_passes,
 766                                         "const checking",
 767                                         || middle::check_const::check_crate(tcx));
 768
 769                                    let access_levels =
 770                                        time(time_passes, "privacy checking", || {
 771                                            rustc_privacy::check_crate(tcx,
 772                                                                       &export_map,
 773                                                                       external_exports)
 774                                        });
 775
 776                                    // Do not move this check past lint
 777                                    time(time_passes, "stability index", || {
 778                                        tcx.stability.borrow_mut().build(tcx, krate, &access_levels)
 779                                    });
 780
 781                                    time(time_passes,
 782                                         "intrinsic checking",
 783                                         || middle::intrinsicck::check_crate(tcx));
 784
 785                                    time(time_passes,
 786                                         "effect checking",
 787                                         || middle::effect::check_crate(tcx));
 788
 789                                    time(time_passes,
 790                                         "match checking",
 791                                         || middle::check_match::check_crate(tcx));
 792
 793                                    let mir_map =
 794                                        time(time_passes,
 795                                             "MIR dump",
 796                                             || mir::mir_map::build_mir_for_crate(tcx));
 797
 798                                    time(time_passes,
 799                                         "liveness checking",
 800                                         || middle::liveness::check_crate(tcx));
 801
 802                                    time(time_passes,
 803                                         "borrow checking",
 804                                         || borrowck::check_crate(tcx));
 805
 806                                    time(time_passes,
 807                                         "rvalue checking",
 808                                         || middle::check_rvalues::check_crate(tcx));
 809
 810                                    // Avoid overwhelming user with errors if type checking failed.
 811                                    // I'm not sure how helpful this is, to be honest, but it avoids
 812                                    // a
 813                                    // lot of annoying errors in the compile-fail tests (basically,
 814                                    // lint warnings and so on -- kindck used to do this abort, but
 815                                    // kindck is gone now). -nmatsakis
 816                                    tcx.sess.abort_if_errors();
 817
 818                                    let reachable_map =
 819                                        time(time_passes,
 820                                             "reachability checking",
 821                                             || reachable::find_reachable(tcx, &access_levels));
 822
 823                                    time(time_passes, "death checking", || {
 824                                        middle::dead::check_crate(tcx, &access_levels);
 825                                    });
 826
 827                                    let ref lib_features_used =
 828                                        time(time_passes,
 829                                             "stability checking",
 830                                             || stability::check_unstable_api_usage(tcx));
 831
 832                                    time(time_passes, "unused lib feature checking", || {
 833                                        stability::check_unused_or_stable_features(&tcx.sess,
 834                                                                                   lib_features_used)
 835                                    });
 836
 837                                    time(time_passes,
 838                                         "lint checking",
 839                                         || lint::check_crate(tcx, &access_levels));
 840
 841                                    // The above three passes generate errors w/o aborting
 842                                    tcx.sess.abort_if_errors();
 843
 844                                    f(tcx,
 845                                      mir_map,
 846                                      ty::CrateAnalysis {
 847                                          export_map: export_map,
 848                                          access_levels: access_levels,
 849                                          reachable: reachable_map,
 850                                          name: name,
 851                                          glob_map: glob_map,
 852                                      })
 853                                })
 854 }
 855
 856 /// Run the translation phase to LLVM, after which the AST and analysis can
 857 /// be discarded.
 858 pub fn phase_4_translate_to_llvm<'tcx>(tcx: &ty::ctxt<'tcx>,
 859                                        mut mir_map: MirMap<'tcx>,
 860                                        analysis: ty::CrateAnalysis)
 861                                        -> trans::CrateTranslation {
 862     let time_passes = tcx.sess.time_passes();
 863
 864     time(time_passes,
 865          "resolving dependency formats",
 866          || dependency_format::calculate(&tcx.sess));
 867
 868     time(time_passes,
 869          "erasing regions from MIR",
 870          || mir::transform::erase_regions::erase_regions(tcx, &mut mir_map));
 871
 872     // Option dance to work around the lack of stack once closures.
 873     time(time_passes,
 874          "translation",
 875          move || trans::trans_crate(tcx, &mir_map, analysis))
 876 }
 877
 878 /// Run LLVM itself, producing a bitcode file, assembly file or object file
 879 /// as a side effect.
 880 pub fn phase_5_run_llvm_passes(sess: &Session,
 881                                trans: &trans::CrateTranslation,
 882                                outputs: &OutputFilenames) {
 883     if sess.opts.cg.no_integrated_as {
 884         let mut map = HashMap::new();
 885         map.insert(OutputType::Assembly, None);
 886         time(sess.time_passes(),
 887              "LLVM passes",
 888              || write::run_passes(sess, trans, &map, outputs));
 889
 890         write::run_assembler(sess, outputs);
 891
 892         // Remove assembly source, unless --save-temps was specified
 893         if !sess.opts.cg.save_temps {
 894             fs::remove_file(&outputs.temp_path(OutputType::Assembly)).unwrap();
 895         }
 896     } else {
 897         time(sess.time_passes(),
 898              "LLVM passes",
 899              || write::run_passes(sess, trans, &sess.opts.output_types, outputs));
 900     }
 901
 902     sess.abort_if_errors();
 903 }
 904
 905 /// Run the linker on any artifacts that resulted from the LLVM run.
 906 /// This should produce either a finished executable or library.
 907 pub fn phase_6_link_output(sess: &Session,
 908                            trans: &trans::CrateTranslation,
 909                            outputs: &OutputFilenames) {
 910     time(sess.time_passes(),
 911          "linking",
 912          || link::link_binary(sess, trans, outputs, &trans.link.crate_name));
 913 }
 914
 915 fn escape_dep_filename(filename: &str) -> String {
 916     // Apparently clang and gcc *only* escape spaces:
 917     // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
 918     filename.replace(" ", "\\ ")
 919 }
 920
 921 fn write_out_deps(sess: &Session, outputs: &OutputFilenames, id: &str) {
 922     let mut out_filenames = Vec::new();
 923     for output_type in sess.opts.output_types.keys() {
 924         let file = outputs.path(*output_type);
 925         match *output_type {
 926             OutputType::Exe => {
 927                 for output in sess.crate_types.borrow().iter() {
 928                     let p = link::filename_for_input(sess, *output, id, outputs);
 929                     out_filenames.push(p);
 930                 }
 931             }
 932             _ => {
 933                 out_filenames.push(file);
 934             }
 935         }
 936     }
 937
 938     // Write out dependency rules to the dep-info file if requested
 939     if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
 940         return;
 941     }
 942     let deps_filename = outputs.path(OutputType::DepInfo);
 943
 944     let result =
 945         (|| -> io::Result<()> {
 946             // Build a list of files used to compile the output and
 947             // write Makefile-compatible dependency rules
 948             let files: Vec<String> = sess.codemap()
 949                                          .files
 950                                          .borrow()
 951                                          .iter()
 952                                          .filter(|fmap| fmap.is_real_file())
 953                                          .filter(|fmap| !fmap.is_imported())
 954                                          .map(|fmap| escape_dep_filename(&fmap.name))
 955                                          .collect();
 956             let mut file = try!(fs::File::create(&deps_filename));
 957             for path in &out_filenames {
 958                 try!(write!(file, "{}: {}\n\n", path.display(), files.join(" ")));
 959             }
 960
 961             // Emit a fake target for each input file to the compilation. This
 962             // prevents `make` from spitting out an error if a file is later
 963             // deleted. For more info see #28735
 964             for path in files {
 965                 try!(writeln!(file, "{}:", path));
 966             }
 967             Ok(())
 968         })();
 969
 970     match result {
 971         Ok(()) => {}
 972         Err(e) => {
 973             sess.fatal(&format!("error writing dependencies to `{}`: {}",
 974                                 deps_filename.display(),
 975                                 e));
 976         }
 977     }
 978 }
 979
 980 pub fn collect_crate_types(session: &Session, attrs: &[ast::Attribute]) -> Vec<config::CrateType> {
 981     // Unconditionally collect crate types from attributes to make them used
 982     let attr_types: Vec<config::CrateType> =
 983         attrs.iter()
 984              .filter_map(|a| {
 985                  if a.check_name("crate_type") {
 986                      match a.value_str() {
 987                          Some(ref n) if *n == "rlib" => {
 988                              Some(config::CrateTypeRlib)
 989                          }
 990                          Some(ref n) if *n == "dylib" => {
 991                              Some(config::CrateTypeDylib)
 992                          }
 993                          Some(ref n) if *n == "lib" => {
 994                              Some(config::default_lib_output())
 995                          }
 996                          Some(ref n) if *n == "staticlib" => {
 997                              Some(config::CrateTypeStaticlib)
 998                          }
 999                          Some(ref n) if *n == "bin" => Some(config::CrateTypeExecutable),
1000                          Some(_) => {
1001                              session.add_lint(lint::builtin::UNKNOWN_CRATE_TYPES,
1002                                               ast::CRATE_NODE_ID,
1003                                               a.span,
1004                                               "invalid `crate_type` value".to_string());
1005                              None
1006                          }
1007                          _ => {
1008                              session.struct_span_err(a.span, "`crate_type` requires a value")
1009                                  .note("for example: `#![crate_type=\"lib\"]`")
1010                                  .emit();
1011                              None
1012                          }
1013                      }
1014                  } else {
1015                      None
1016                  }
1017              })
1018              .collect();
1019
1020     // If we're generating a test executable, then ignore all other output
1021     // styles at all other locations
1022     if session.opts.test {
1023         return vec![config::CrateTypeExecutable];
1024     }
1025
1026     // Only check command line flags if present. If no types are specified by
1027     // command line, then reuse the empty `base` Vec to hold the types that
1028     // will be found in crate attributes.
1029     let mut base = session.opts.crate_types.clone();
1030     if base.is_empty() {
1031         base.extend(attr_types);
1032         if base.is_empty() {
1033             base.push(link::default_output_for_target(session));
1034         }
1035         base.sort();
1036         base.dedup();
1037     }
1038
1039     base.into_iter()
1040         .filter(|crate_type| {
1041             let res = !link::invalid_output_for_target(session, *crate_type);
1042
1043             if !res {
1044                 session.warn(&format!("dropping unsupported crate type `{}` for target `{}`",
1045                                       *crate_type,
1046                                       session.opts.target_triple));
1047             }
1048
1049             res
1050         })
1051         .collect()
1052 }
1053
1054 pub fn collect_crate_metadata(session: &Session, _attrs: &[ast::Attribute]) -> Vec<String> {
1055     session.opts.cg.metadata.clone()
1056 }
1057
1058 pub fn build_output_filenames(input: &Input,
1059                               odir: &Option<PathBuf>,
1060                               ofile: &Option<PathBuf>,
1061                               attrs: &[ast::Attribute],
1062                               sess: &Session)
1063                               -> OutputFilenames {
1064     match *ofile {
1065         None => {
1066             // "-" as input file will cause the parser to read from stdin so we
1067             // have to make up a name
1068             // We want to toss everything after the final '.'
1069             let dirpath = match *odir {
1070                 Some(ref d) => d.clone(),
1071                 None => PathBuf::new(),
1072             };
1073
1074             // If a crate name is present, we use it as the link name
1075             let stem = sess.opts
1076                            .crate_name
1077                            .clone()
1078                            .or_else(|| attr::find_crate_name(attrs).map(|n| n.to_string()))
1079                            .unwrap_or(input.filestem());
1080
1081             OutputFilenames {
1082                 out_directory: dirpath,
1083                 out_filestem: stem,
1084                 single_output_file: None,
1085                 extra: sess.opts.cg.extra_filename.clone(),
1086                 outputs: sess.opts.output_types.clone(),
1087             }
1088         }
1089
1090         Some(ref out_file) => {
1091             let unnamed_output_types = sess.opts
1092                                            .output_types
1093                                            .values()
1094                                            .filter(|a| a.is_none())
1095                                            .count();
1096             let ofile = if unnamed_output_types > 1 {
1097                 sess.warn("ignoring specified output filename because multiple outputs were \
1098                            requested");
1099                 None
1100             } else {
1101                 Some(out_file.clone())
1102             };
1103             if *odir != None {
1104                 sess.warn("ignoring --out-dir flag due to -o flag.");
1105             }
1106
1107             let cur_dir = Path::new("");
1108
1109             OutputFilenames {
1110                 out_directory: out_file.parent().unwrap_or(cur_dir).to_path_buf(),
1111                 out_filestem: out_file.file_stem()
1112                                       .unwrap_or(OsStr::new(""))
1113                                       .to_str()
1114                                       .unwrap()
1115                                       .to_string(),
1116                 single_output_file: ofile,
1117                 extra: sess.opts.cg.extra_filename.clone(),
1118                 outputs: sess.opts.output_types.clone(),
1119             }
1120         }
1121     }
1122 }