1 use crate::interface::{Compiler, Result};
2 use crate::proc_macro_decls;
5 use log::{info, log_enabled, warn};
6 use rustc_ast::mut_visit::MutVisitor;
7 use rustc_ast::{self, ast, visit};
8 use rustc_codegen_ssa::back::link::emit_metadata;
9 use rustc_codegen_ssa::traits::CodegenBackend;
10 use rustc_data_structures::sync::{par_iter, Lrc, OnceCell, ParallelIterator, WorkerLocal};
11 use rustc_data_structures::{box_region_allow_access, declare_box_region_type, parallel};
12 use rustc_errors::{ErrorReported, PResult};
13 use rustc_expand::base::ExtCtxt;
14 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
15 use rustc_hir::definitions::Definitions;
17 use rustc_lint::LintStore;
18 use rustc_middle::arena::Arena;
19 use rustc_middle::dep_graph::DepGraph;
20 use rustc_middle::middle;
21 use rustc_middle::middle::cstore::{CrateStore, MetadataLoader, MetadataLoaderDyn};
22 use rustc_middle::ty::steal::Steal;
23 use rustc_middle::ty::{self, GlobalCtxt, ResolverOutputs, TyCtxt};
25 use rustc_mir_build as mir_build;
26 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
27 use rustc_passes::{self, hir_stats, layout_test};
28 use rustc_plugin_impl as plugin;
29 use rustc_resolve::{Resolver, ResolverArenas};
30 use rustc_session::config::{CrateType, Input, OutputFilenames, OutputType, PpMode, PpSourceMode};
31 use rustc_session::lint;
32 use rustc_session::output::{filename_for_input, filename_for_metadata};
33 use rustc_session::search_paths::PathKind;
34 use rustc_session::Session;
35 use rustc_span::symbol::Symbol;
36 use rustc_span::{FileName, RealFileName};
37 use rustc_trait_selection::traits;
38 use rustc_typeck as typeck;
40 use rustc_serialize::json;
41 use tempfile::Builder as TempFileBuilder;
44 use std::cell::RefCell;
45 use std::ffi::OsString;
46 use std::io::{self, BufWriter, Write};
47 use std::path::PathBuf;
49 use std::{env, fs, iter, mem};
51 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
52 let krate = sess.time("parse_crate", || match input {
53 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
54 Input::Str { input, name } => {
55 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
59 if sess.opts.debugging_opts.ast_json_noexpand {
60 println!("{}", json::as_json(&krate));
63 if sess.opts.debugging_opts.input_stats {
64 println!("Lines of code: {}", sess.source_map().count_lines());
65 println!("Pre-expansion node count: {}", count_nodes(&krate));
68 if let Some(ref s) = sess.opts.debugging_opts.show_span {
69 rustc_ast_passes::show_span::run(sess.diagnostic(), s, &krate);
72 if sess.opts.debugging_opts.hir_stats {
73 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
79 fn count_nodes(krate: &ast::Crate) -> usize {
80 let mut counter = rustc_ast_passes::node_count::NodeCounter::new();
81 visit::walk_crate(&mut counter, krate);
85 declare_box_region_type!(
88 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
91 /// Runs the "early phases" of the compiler: initial `cfg` processing, loading compiler plugins,
92 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
93 /// harness if one is to be provided, injection of a dependency on the
94 /// standard library and prelude, and name resolution.
96 /// Returns `None` if we're aborting after handling -W help.
97 pub fn configure_and_expand(
99 lint_store: Lrc<LintStore>,
100 metadata_loader: Box<MetadataLoaderDyn>,
103 ) -> Result<(ast::Crate, BoxedResolver)> {
104 // Currently, we ignore the name resolution data structures for the purposes of dependency
105 // tracking. Instead we will run name resolution and include its output in the hash of each
106 // item, much like we do for macro expansion. In other words, the hash reflects not just
107 // its contents but the results of name resolution on those contents. Hopefully we'll push
108 // this back at some point.
109 let crate_name = crate_name.to_string();
110 let (result, resolver) = BoxedResolver::new(static move |mut action| {
113 let resolver_arenas = Resolver::arenas();
114 let res = configure_and_expand_inner(
122 let mut resolver = match res {
124 yield BoxedResolver::initial_yield(Err(v));
127 Ok((krate, resolver)) => {
128 action = yield BoxedResolver::initial_yield(Ok(krate));
132 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver), action);
133 resolver.into_outputs()
135 result.map(|k| (k, resolver))
139 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
140 match Rc::try_unwrap(resolver) {
141 Ok(resolver) => resolver.into_inner().complete(),
142 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
147 pub fn register_plugins<'a>(
149 metadata_loader: &'a dyn MetadataLoader,
150 register_lints: impl Fn(&Session, &mut LintStore),
151 mut krate: ast::Crate,
153 ) -> Result<(ast::Crate, Lrc<LintStore>)> {
154 krate = sess.time("attributes_injection", || {
155 rustc_builtin_macros::cmdline_attrs::inject(
158 &sess.opts.debugging_opts.crate_attr,
162 let (krate, features) = rustc_expand::config::features(
166 &sess.opts.debugging_opts.allow_features,
168 // these need to be set "early" so that expansion sees `quote` if enabled.
169 sess.init_features(features);
171 let crate_types = util::collect_crate_types(sess, &krate.attrs);
172 sess.init_crate_types(crate_types);
174 let disambiguator = util::compute_crate_disambiguator(sess);
175 sess.crate_disambiguator.set(disambiguator).expect("not yet initialized");
176 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
178 if sess.opts.incremental.is_some() {
179 sess.time("incr_comp_garbage_collect_session_directories", || {
180 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
182 "Error while trying to garbage collect incremental \
183 compilation cache directory: {}",
190 sess.time("recursion_limit", || {
191 middle::limits::update_limits(sess, &krate);
194 let mut lint_store = rustc_lint::new_lint_store(
195 sess.opts.debugging_opts.no_interleave_lints,
196 sess.unstable_options(),
198 register_lints(&sess, &mut lint_store);
201 sess.time("plugin_loading", || plugin::load::load_plugins(sess, metadata_loader, &krate));
202 sess.time("plugin_registration", || {
203 let mut registry = plugin::Registry { lint_store: &mut lint_store };
204 for registrar in registrars {
205 registrar(&mut registry);
209 Ok((krate, Lrc::new(lint_store)))
212 fn pre_expansion_lint(sess: &Session, lint_store: &LintStore, krate: &ast::Crate) {
213 sess.time("pre_AST_expansion_lint_checks", || {
214 rustc_lint::check_ast_crate(
220 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
225 fn configure_and_expand_inner<'a>(
227 lint_store: &'a LintStore,
228 mut krate: ast::Crate,
230 resolver_arenas: &'a ResolverArenas<'a>,
231 metadata_loader: &'a MetadataLoaderDyn,
232 ) -> Result<(ast::Crate, Resolver<'a>)> {
233 pre_expansion_lint(sess, lint_store, &krate);
235 let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
236 rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
238 krate = sess.time("crate_injection", || {
239 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
240 let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
246 if let Some(name) = name {
247 sess.parse_sess.injected_crate_name.set(name).expect("not yet initialized");
252 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
255 krate = sess.time("macro_expand_crate", || {
256 // Windows dlls do not have rpaths, so they don't know how to find their
257 // dependencies. It's up to us to tell the system where to find all the
258 // dependent dlls. Note that this uses cfg!(windows) as opposed to
259 // targ_cfg because syntax extensions are always loaded for the host
260 // compiler, not for the target.
262 // This is somewhat of an inherently racy operation, however, as
263 // multiple threads calling this function could possibly continue
264 // extending PATH far beyond what it should. To solve this for now we
265 // just don't add any new elements to PATH which are already there
266 // within PATH. This is basically a targeted fix at #17360 for rustdoc
267 // which runs rustc in parallel but has been seen (#33844) to cause
268 // problems with PATH becoming too long.
269 let mut old_path = OsString::new();
271 old_path = env::var_os("PATH").unwrap_or(old_path);
272 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
273 for path in env::split_paths(&old_path) {
274 if !new_path.contains(&path) {
281 new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
287 // Create the config for macro expansion
288 let features = sess.features_untracked();
289 let cfg = rustc_expand::expand::ExpansionConfig {
290 features: Some(&features),
291 recursion_limit: sess.recursion_limit(),
292 trace_mac: sess.opts.debugging_opts.trace_macros,
293 should_test: sess.opts.test,
294 ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
297 let extern_mod_loaded = |k: &ast::Crate| pre_expansion_lint(sess, lint_store, k);
298 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver, Some(&extern_mod_loaded));
300 // Expand macros now!
301 let krate = sess.time("expand_crate", || ecx.monotonic_expander().expand_crate(krate));
303 // The rest is error reporting
305 sess.time("check_unused_macros", || {
306 ecx.check_unused_macros();
309 let mut missing_fragment_specifiers: Vec<_> =
310 ecx.parse_sess.missing_fragment_specifiers.borrow().iter().cloned().collect();
311 missing_fragment_specifiers.sort();
313 let recursion_limit_hit = ecx.reduced_recursion_limit.is_some();
315 for span in missing_fragment_specifiers {
316 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
317 let msg = "missing fragment specifier";
318 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
321 env::set_var("PATH", &old_path);
324 if recursion_limit_hit {
325 // If we hit a recursion limit, exit early to avoid later passes getting overwhelmed
333 sess.time("maybe_building_test_harness", || {
334 rustc_builtin_macros::test_harness::inject(
340 &sess.features_untracked(),
341 sess.panic_strategy(),
342 sess.target.target.options.panic_strategy,
343 sess.opts.debugging_opts.panic_abort_tests,
347 // If we're actually rustdoc then there's no need to actually compile
348 // anything, so switch everything to just looping
349 let mut should_loop = sess.opts.actually_rustdoc;
350 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
354 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
357 let has_proc_macro_decls = sess.time("AST_validation", || {
358 rustc_ast_passes::ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
361 let crate_types = sess.crate_types();
362 let is_proc_macro_crate = crate_types.contains(&CrateType::ProcMacro);
364 // For backwards compatibility, we don't try to run proc macro injection
365 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
366 // specified. This should only affect users who manually invoke 'rustdoc', as
367 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
368 // However, we do emit a warning, to let such users know that they should
369 // start passing '--crate-type proc-macro'
370 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
371 let mut msg = sess.diagnostic().struct_warn(
372 &"Trying to document proc macro crate \
373 without passing '--crate-type proc-macro to rustdoc",
376 msg.warn("The generated documentation may be incorrect");
379 krate = sess.time("maybe_create_a_macro_crate", || {
380 let num_crate_types = crate_types.len();
381 let is_test_crate = sess.opts.test;
382 rustc_builtin_macros::proc_macro_harness::inject(
387 has_proc_macro_decls,
395 // Done with macro expansion!
397 if sess.opts.debugging_opts.input_stats {
398 println!("Post-expansion node count: {}", count_nodes(&krate));
401 if sess.opts.debugging_opts.hir_stats {
402 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
405 if sess.opts.debugging_opts.ast_json {
406 println!("{}", json::as_json(&krate));
409 resolver.resolve_crate(&krate);
411 // Needs to go *after* expansion to be able to check the results of macro expansion.
412 sess.time("complete_gated_feature_checking", || {
413 rustc_ast_passes::feature_gate::check_crate(
416 &sess.features_untracked(),
417 sess.opts.unstable_features,
421 // Add all buffered lints from the `ParseSess` to the `Session`.
422 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
423 info!("{} parse sess buffered_lints", buffered_lints.len());
424 for early_lint in buffered_lints.drain(..) {
425 resolver.lint_buffer().add_early_lint(early_lint);
429 Ok((krate, resolver))
432 pub fn lower_to_hir<'res, 'tcx>(
434 lint_store: &LintStore,
435 resolver: &'res mut Resolver<'_>,
436 dep_graph: &'res DepGraph,
437 krate: &'res ast::Crate,
438 arena: &'tcx rustc_ast_lowering::Arena<'tcx>,
440 // We're constructing the HIR here; we don't care what we will
441 // read, since we haven't even constructed the *input* to
443 dep_graph.assert_ignored();
446 let hir_crate = rustc_ast_lowering::lower_crate(
450 rustc_parse::nt_to_tokenstream,
454 if sess.opts.debugging_opts.hir_stats {
455 hir_stats::print_hir_stats(&hir_crate);
458 sess.time("early_lint_checks", || {
459 rustc_lint::check_ast_crate(
464 Some(std::mem::take(resolver.lint_buffer())),
465 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
469 // Discard hygiene data, which isn't required after lowering to HIR.
470 if !sess.opts.debugging_opts.keep_hygiene_data {
471 rustc_span::hygiene::clear_syntax_context_map();
477 // Returns all the paths that correspond to generated files.
478 fn generated_output_paths(
480 outputs: &OutputFilenames,
484 let mut out_filenames = Vec::new();
485 for output_type in sess.opts.output_types.keys() {
486 let file = outputs.path(*output_type);
488 // If the filename has been overridden using `-o`, it will not be modified
489 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
490 OutputType::Exe if !exact_name => {
491 for crate_type in sess.crate_types().iter() {
492 let p = filename_for_input(sess, *crate_type, crate_name, outputs);
493 out_filenames.push(p);
496 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
497 // Don't add the dep-info output when omitting it from dep-info targets
500 out_filenames.push(file);
507 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
508 // returns None for every file path.
509 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
511 F: Fn(&PathBuf) -> Option<T>,
513 for output_path in output_paths {
514 if let Some(result) = f(output_path) {
521 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
522 let input_path = input_path.canonicalize().ok();
523 if input_path.is_none() {
526 let check = |output_path: &PathBuf| {
527 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
529 check_output(output_paths, check).is_some()
532 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
533 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
534 check_output(output_paths, check)
537 fn escape_dep_filename(filename: &FileName) -> String {
538 // Apparently clang and gcc *only* escape spaces:
539 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
540 filename.to_string().replace(" ", "\\ ")
545 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
546 outputs: &OutputFilenames,
547 out_filenames: &[PathBuf],
549 // Write out dependency rules to the dep-info file if requested
550 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
553 let deps_filename = outputs.path(OutputType::DepInfo);
555 let result = (|| -> io::Result<()> {
556 // Build a list of files used to compile the output and
557 // write Makefile-compatible dependency rules
558 let mut files: Vec<String> = sess
562 .filter(|fmap| fmap.is_real_file())
563 .filter(|fmap| !fmap.is_imported())
564 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
567 if sess.binary_dep_depinfo() {
568 boxed_resolver.borrow().borrow_mut().access(|resolver| {
569 for cnum in resolver.cstore().crates_untracked() {
570 let source = resolver.cstore().crate_source_untracked(cnum);
571 if let Some((path, _)) = source.dylib {
572 let file_name = FileName::Real(RealFileName::Named(path));
573 files.push(escape_dep_filename(&file_name));
575 if let Some((path, _)) = source.rlib {
576 let file_name = FileName::Real(RealFileName::Named(path));
577 files.push(escape_dep_filename(&file_name));
579 if let Some((path, _)) = source.rmeta {
580 let file_name = FileName::Real(RealFileName::Named(path));
581 files.push(escape_dep_filename(&file_name));
587 let mut file = BufWriter::new(fs::File::create(&deps_filename)?);
588 for path in out_filenames {
589 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
592 // Emit a fake target for each input file to the compilation. This
593 // prevents `make` from spitting out an error if a file is later
594 // deleted. For more info see #28735
596 writeln!(file, "{}:", path)?;
603 if sess.opts.json_artifact_notifications {
606 .emit_artifact_notification(&deps_filename, "dep-info");
609 Err(e) => sess.fatal(&format!(
610 "error writing dependencies to `{}`: {}",
611 deps_filename.display(),
617 pub fn prepare_outputs(
621 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
623 ) -> Result<OutputFilenames> {
624 let _timer = sess.timer("prepare_outputs");
626 // FIXME: rustdoc passes &[] instead of &krate.attrs here
627 let outputs = util::build_output_filenames(
629 &compiler.output_dir,
630 &compiler.output_file,
636 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
638 // Ensure the source file isn't accidentally overwritten during compilation.
639 if let Some(ref input_path) = compiler.input_path {
640 if sess.opts.will_create_output_file() {
641 if output_contains_path(&output_paths, input_path) {
643 "the input file \"{}\" would be overwritten by the generated \
647 return Err(ErrorReported);
649 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
651 "the generated executable for the input file \"{}\" conflicts with the \
652 existing directory \"{}\"",
653 input_path.display(),
656 return Err(ErrorReported);
661 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
663 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
664 && sess.opts.output_types.len() == 1;
667 if let Some(ref dir) = compiler.output_dir {
668 if fs::create_dir_all(dir).is_err() {
669 sess.err("failed to find or create the directory specified by `--out-dir`");
670 return Err(ErrorReported);
678 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
679 providers.analysis = analysis;
680 proc_macro_decls::provide(providers);
681 plugin::build::provide(providers);
682 rustc_middle::hir::provide(providers);
683 mir::provide(providers);
684 mir_build::provide(providers);
685 rustc_privacy::provide(providers);
686 typeck::provide(providers);
687 ty::provide(providers);
688 traits::provide(providers);
689 rustc_passes::provide(providers);
690 rustc_resolve::provide(providers);
691 rustc_traits::provide(providers);
692 rustc_ty::provide(providers);
693 rustc_metadata::provide(providers);
694 rustc_lint::provide(providers);
695 rustc_symbol_mangling::provide(providers);
696 rustc_codegen_ssa::provide(providers);
699 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
700 rustc_metadata::provide_extern(providers);
701 rustc_codegen_ssa::provide_extern(providers);
704 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
706 impl<'tcx> QueryContext<'tcx> {
707 pub fn enter<F, R>(&mut self, f: F) -> R
709 F: FnOnce(TyCtxt<'tcx>) -> R,
711 ty::tls::enter_global(self.0, f)
714 pub fn print_stats(&mut self) {
715 self.enter(ty::query::print_stats)
719 pub fn create_global_ctxt<'tcx>(
720 compiler: &'tcx Compiler,
721 lint_store: Lrc<LintStore>,
722 krate: &'tcx Crate<'tcx>,
724 mut resolver_outputs: ResolverOutputs,
725 outputs: OutputFilenames,
727 global_ctxt: &'tcx OnceCell<GlobalCtxt<'tcx>>,
728 arena: &'tcx WorkerLocal<Arena<'tcx>>,
729 ) -> QueryContext<'tcx> {
730 let sess = &compiler.session();
731 let defs: &'tcx Definitions = arena.alloc(mem::take(&mut resolver_outputs.definitions));
733 let query_result_on_disk_cache = rustc_incremental::load_query_result_cache(sess);
735 let codegen_backend = compiler.codegen_backend();
736 let mut local_providers = ty::query::Providers::default();
737 default_provide(&mut local_providers);
738 codegen_backend.provide(&mut local_providers);
740 let mut extern_providers = local_providers;
741 default_provide_extern(&mut extern_providers);
742 codegen_backend.provide_extern(&mut extern_providers);
744 if let Some(callback) = compiler.override_queries {
745 callback(sess, &mut local_providers, &mut extern_providers);
748 let gcx = sess.time("setup_global_ctxt", || {
749 global_ctxt.get_or_init(|| {
750 TyCtxt::create_global_ctxt(
760 query_result_on_disk_cache,
767 // Do some initialization of the DepGraph that can only be done with the tcx available.
768 ty::tls::enter_global(&gcx, |tcx| {
769 tcx.sess.time("dep_graph_tcx_init", || rustc_incremental::dep_graph_tcx_init(tcx));
775 /// Runs the resolution, type-checking, region checking and other
776 /// miscellaneous analysis passes on the crate.
777 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
778 assert_eq!(cnum, LOCAL_CRATE);
780 rustc_passes::hir_id_validator::check_crate(tcx);
783 let mut entry_point = None;
785 sess.time("misc_checking_1", || {
789 .time("looking_for_entry_point", || rustc_passes::entry::find_entry_point(tcx));
791 sess.time("looking_for_plugin_registrar", || {
792 plugin::build::find_plugin_registrar(tcx)
795 sess.time("looking_for_derive_registrar", || proc_macro_decls::find(tcx));
798 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
799 let local_def_id = tcx.hir().local_def_id(module);
800 tcx.ensure().check_mod_loops(local_def_id);
801 tcx.ensure().check_mod_attrs(local_def_id);
802 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
803 tcx.ensure().check_mod_const_bodies(local_def_id);
809 // passes are timed inside typeck
810 typeck::check_crate(tcx)?;
812 sess.time("misc_checking_2", || {
815 sess.time("match_checking", || {
816 tcx.par_body_owners(|def_id| {
817 tcx.ensure().check_match(def_id.to_def_id());
822 sess.time("liveness_and_intrinsic_checking", || {
823 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
824 // this must run before MIR dump, because
825 // "not all control paths return a value" is reported here.
827 // maybe move the check to a MIR pass?
828 let local_def_id = tcx.hir().local_def_id(module);
830 tcx.ensure().check_mod_liveness(local_def_id);
831 tcx.ensure().check_mod_intrinsics(local_def_id);
838 sess.time("MIR_borrow_checking", || {
839 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
842 sess.time("MIR_effect_checking", || {
843 for def_id in tcx.body_owners() {
844 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
848 sess.time("layout_testing", || layout_test::test_layout(tcx));
850 // Avoid overwhelming user with errors if borrow checking failed.
851 // I'm not sure how helpful this is, to be honest, but it avoids a
852 // lot of annoying errors in the compile-fail tests (basically,
853 // lint warnings and so on -- kindck used to do this abort, but
854 // kindck is gone now). -nmatsakis
855 if sess.has_errors() {
856 return Err(ErrorReported);
859 sess.time("misc_checking_3", || {
862 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
866 tcx.ensure().check_private_in_public(LOCAL_CRATE);
869 sess.time("death_checking", || rustc_passes::dead::check_crate(tcx));
872 sess.time("unused_lib_feature_checking", || {
873 rustc_passes::stability::check_unused_or_stable_features(tcx)
877 sess.time("lint_checking", || {
878 rustc_lint::check_crate(tcx, || {
879 rustc_lint::BuiltinCombinedLateLintPass::new()
886 sess.time("privacy_checking_modules", || {
887 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
888 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
898 fn encode_and_write_metadata(
900 outputs: &OutputFilenames,
901 ) -> (middle::cstore::EncodedMetadata, bool) {
902 #[derive(PartialEq, Eq, PartialOrd, Ord)]
909 let metadata_kind = tcx
913 .map(|ty| match *ty {
914 CrateType::Executable | CrateType::Staticlib | CrateType::Cdylib => MetadataKind::None,
916 CrateType::Rlib => MetadataKind::Uncompressed,
918 CrateType::Dylib | CrateType::ProcMacro => MetadataKind::Compressed,
921 .unwrap_or(MetadataKind::None);
923 let metadata = match metadata_kind {
924 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
925 MetadataKind::Uncompressed | MetadataKind::Compressed => tcx.encode_metadata(),
928 let _prof_timer = tcx.sess.prof.generic_activity("write_crate_metadata");
930 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
931 if need_metadata_file {
932 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
933 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
934 // To avoid races with another rustc process scanning the output directory,
935 // we need to write the file somewhere else and atomically move it to its
936 // final destination, with an `fs::rename` call. In order for the rename to
937 // always succeed, the temporary file needs to be on the same filesystem,
938 // which is why we create it inside the output directory specifically.
939 let metadata_tmpdir = TempFileBuilder::new()
941 .tempdir_in(out_filename.parent().unwrap())
942 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
943 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
944 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
945 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
947 if tcx.sess.opts.json_artifact_notifications {
951 .emit_artifact_notification(&out_filename, "metadata");
955 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
957 (metadata, need_metadata_module)
960 /// Runs the codegen backend, after which the AST and analysis can
962 pub fn start_codegen<'tcx>(
963 codegen_backend: &dyn CodegenBackend,
965 outputs: &OutputFilenames,
967 if log_enabled!(::log::Level::Info) {
968 println!("Pre-codegen");
969 tcx.print_debug_stats();
972 let (metadata, need_metadata_module) = encode_and_write_metadata(tcx, outputs);
974 let codegen = tcx.sess.time("codegen_crate", move || {
975 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
978 if log_enabled!(::log::Level::Info) {
979 println!("Post-codegen");
980 tcx.print_debug_stats();
983 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
984 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
985 tcx.sess.err(&format!("could not emit MIR: {}", e));
986 tcx.sess.abort_if_errors();