1 use crate::interface::{Compiler, Result};
2 use crate::proc_macro_decls;
5 use log::{info, log_enabled, warn};
6 use rustc::arena::Arena;
7 use rustc::dep_graph::DepGraph;
11 use rustc::middle::cstore::{CrateStore, MetadataLoader, MetadataLoaderDyn};
12 use rustc::session::config::{self, CrateType, Input, OutputFilenames, OutputType};
13 use rustc::session::config::{PpMode, PpSourceMode};
14 use rustc::session::search_paths::PathKind;
15 use rustc::session::Session;
17 use rustc::ty::steal::Steal;
18 use rustc::ty::{self, AllArenas, GlobalCtxt, ResolverOutputs, TyCtxt};
19 use rustc::util::common::ErrorReported;
20 use rustc_builtin_macros;
21 use rustc_codegen_ssa::back::link::emit_metadata;
22 use rustc_codegen_utils::codegen_backend::CodegenBackend;
23 use rustc_codegen_utils::link::filename_for_metadata;
24 use rustc_data_structures::sync::{par_iter, Lrc, Once, ParallelIterator, WorkerLocal};
25 use rustc_data_structures::{box_region_allow_access, declare_box_region_type, parallel};
26 use rustc_errors::PResult;
27 use rustc_expand::base::ExtCtxt;
28 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
29 use rustc_incremental;
31 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
32 use rustc_passes::{self, ast_validation, hir_stats, layout_test};
33 use rustc_plugin_impl as plugin;
35 use rustc_resolve::{Resolver, ResolverArenas};
36 use rustc_span::symbol::Symbol;
37 use rustc_span::FileName;
39 use rustc_typeck as typeck;
40 use syntax::early_buffered_lints::BufferedEarlyLint;
41 use syntax::mut_visit::MutVisitor;
42 use syntax::util::node_count::NodeCounter;
43 use syntax::{self, ast, visit};
45 use rustc_serialize::json;
46 use tempfile::Builder as TempFileBuilder;
49 use std::cell::RefCell;
50 use std::ffi::OsString;
51 use std::io::{self, Write};
52 use std::path::PathBuf;
54 use std::{env, fs, iter, mem};
56 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
57 let krate = sess.time("parsing", || match input {
58 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
59 Input::Str { input, name } => {
60 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
64 if sess.opts.debugging_opts.ast_json_noexpand {
65 println!("{}", json::as_json(&krate));
68 if sess.opts.debugging_opts.input_stats {
69 println!("Lines of code: {}", sess.source_map().count_lines());
70 println!("Pre-expansion node count: {}", count_nodes(&krate));
73 if let Some(ref s) = sess.opts.debugging_opts.show_span {
74 syntax::show_span::run(sess.diagnostic(), s, &krate);
77 if sess.opts.debugging_opts.hir_stats {
78 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
84 fn count_nodes(krate: &ast::Crate) -> usize {
85 let mut counter = NodeCounter::new();
86 visit::walk_crate(&mut counter, krate);
90 declare_box_region_type!(
93 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
96 /// Runs the "early phases" of the compiler: initial `cfg` processing, loading compiler plugins,
97 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
98 /// harness if one is to be provided, injection of a dependency on the
99 /// standard library and prelude, and name resolution.
101 /// Returns `None` if we're aborting after handling -W help.
102 pub fn configure_and_expand(
104 lint_store: Lrc<lint::LintStore>,
105 metadata_loader: Box<MetadataLoaderDyn>,
108 ) -> Result<(ast::Crate, BoxedResolver)> {
109 // Currently, we ignore the name resolution data structures for the purposes of dependency
110 // tracking. Instead we will run name resolution and include its output in the hash of each
111 // item, much like we do for macro expansion. In other words, the hash reflects not just
112 // its contents but the results of name resolution on those contents. Hopefully we'll push
113 // this back at some point.
114 let crate_name = crate_name.to_string();
115 let (result, resolver) = BoxedResolver::new(static move || {
117 let resolver_arenas = Resolver::arenas();
118 let res = configure_and_expand_inner(
126 let mut resolver = match res {
128 yield BoxedResolver::initial_yield(Err(v));
131 Ok((krate, resolver)) => {
132 yield BoxedResolver::initial_yield(Ok(krate));
136 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver));
137 resolver.into_outputs()
139 result.map(|k| (k, resolver))
143 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
144 match Rc::try_unwrap(resolver) {
145 Ok(resolver) => resolver.into_inner().complete(),
146 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
151 pub fn register_plugins<'a>(
153 metadata_loader: &'a dyn MetadataLoader,
154 register_lints: impl Fn(&Session, &mut lint::LintStore),
155 mut krate: ast::Crate,
157 ) -> Result<(ast::Crate, Lrc<lint::LintStore>)> {
158 krate = sess.time("attributes injection", || {
159 rustc_builtin_macros::cmdline_attrs::inject(
162 &sess.opts.debugging_opts.crate_attr,
166 let (krate, features) = rustc_expand::config::features(
170 &sess.opts.debugging_opts.allow_features,
172 // these need to be set "early" so that expansion sees `quote` if enabled.
173 sess.init_features(features);
175 let crate_types = util::collect_crate_types(sess, &krate.attrs);
176 sess.crate_types.set(crate_types);
178 let disambiguator = util::compute_crate_disambiguator(sess);
179 sess.crate_disambiguator.set(disambiguator);
180 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
182 if sess.opts.incremental.is_some() {
183 sess.time("garbage-collect incremental cache directory", || {
185 sess.prof.generic_activity("incr_comp_garbage_collect_session_directories");
186 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
188 "Error while trying to garbage collect incremental \
189 compilation cache directory: {}",
196 sess.time("recursion limit", || {
197 middle::recursion_limit::update_limits(sess, &krate);
200 let mut lint_store = rustc_lint::new_lint_store(
201 sess.opts.debugging_opts.no_interleave_lints,
202 sess.unstable_options(),
204 register_lints(&sess, &mut lint_store);
207 sess.time("plugin loading", || plugin::load::load_plugins(sess, metadata_loader, &krate));
208 sess.time("plugin registration", || {
209 let mut registry = plugin::Registry { lint_store: &mut lint_store };
210 for registrar in registrars {
211 registrar(&mut registry);
215 Ok((krate, Lrc::new(lint_store)))
218 fn configure_and_expand_inner<'a>(
220 lint_store: &'a lint::LintStore,
221 mut krate: ast::Crate,
223 resolver_arenas: &'a ResolverArenas<'a>,
224 metadata_loader: &'a MetadataLoaderDyn,
225 ) -> Result<(ast::Crate, Resolver<'a>)> {
226 sess.time("pre-AST-expansion lint checks", || {
227 rustc_lint::check_ast_crate(
233 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
237 let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
238 rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
240 krate = sess.time("crate injection", || {
241 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
242 let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
248 if let Some(name) = name {
249 sess.parse_sess.injected_crate_name.set(name);
254 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
257 krate = sess.time("expansion", || {
258 // Windows dlls do not have rpaths, so they don't know how to find their
259 // dependencies. It's up to us to tell the system where to find all the
260 // dependent dlls. Note that this uses cfg!(windows) as opposed to
261 // targ_cfg because syntax extensions are always loaded for the host
262 // compiler, not for the target.
264 // This is somewhat of an inherently racy operation, however, as
265 // multiple threads calling this function could possibly continue
266 // extending PATH far beyond what it should. To solve this for now we
267 // just don't add any new elements to PATH which are already there
268 // within PATH. This is basically a targeted fix at #17360 for rustdoc
269 // which runs rustc in parallel but has been seen (#33844) to cause
270 // problems with PATH becoming too long.
271 let mut old_path = OsString::new();
273 old_path = env::var_os("PATH").unwrap_or(old_path);
274 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
275 for path in env::split_paths(&old_path) {
276 if !new_path.contains(&path) {
283 new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
289 // Create the config for macro expansion
290 let features = sess.features_untracked();
291 let cfg = rustc_expand::expand::ExpansionConfig {
292 features: Some(&features),
293 recursion_limit: *sess.recursion_limit.get(),
294 trace_mac: sess.opts.debugging_opts.trace_macros,
295 should_test: sess.opts.test,
296 ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
299 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
301 // Expand macros now!
302 let krate = sess.time("expand crate", || ecx.monotonic_expander().expand_crate(krate));
304 // The rest is error reporting
306 sess.time("check unused macros", || {
307 ecx.check_unused_macros();
310 let mut missing_fragment_specifiers: Vec<_> =
311 ecx.parse_sess.missing_fragment_specifiers.borrow().iter().cloned().collect();
312 missing_fragment_specifiers.sort();
314 for span in missing_fragment_specifiers {
315 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
316 let msg = "missing fragment specifier";
317 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
320 env::set_var("PATH", &old_path);
325 sess.time("maybe building test harness", || {
326 rustc_builtin_macros::test_harness::inject(
332 &sess.features_untracked(),
333 sess.panic_strategy(),
334 sess.target.target.options.panic_strategy,
335 sess.opts.debugging_opts.panic_abort_tests,
339 // If we're actually rustdoc then there's no need to actually compile
340 // anything, so switch everything to just looping
341 let mut should_loop = sess.opts.actually_rustdoc;
342 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
346 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
349 let has_proc_macro_decls = sess.time("AST validation", || {
350 ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
353 let crate_types = sess.crate_types.borrow();
354 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
356 // For backwards compatibility, we don't try to run proc macro injection
357 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
358 // specified. This should only affect users who manually invoke 'rustdoc', as
359 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
360 // However, we do emit a warning, to let such users know that they should
361 // start passing '--crate-type proc-macro'
362 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
363 let mut msg = sess.diagnostic().struct_warn(
364 &"Trying to document proc macro crate \
365 without passing '--crate-type proc-macro to rustdoc",
368 msg.warn("The generated documentation may be incorrect");
371 krate = sess.time("maybe creating a macro crate", || {
372 let num_crate_types = crate_types.len();
373 let is_test_crate = sess.opts.test;
374 rustc_builtin_macros::proc_macro_harness::inject(
379 has_proc_macro_decls,
387 // Done with macro expansion!
389 if sess.opts.debugging_opts.input_stats {
390 println!("Post-expansion node count: {}", count_nodes(&krate));
393 if sess.opts.debugging_opts.hir_stats {
394 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
397 if sess.opts.debugging_opts.ast_json {
398 println!("{}", json::as_json(&krate));
401 sess.time("name resolution", || {
402 resolver.resolve_crate(&krate);
405 // Needs to go *after* expansion to be able to check the results of macro expansion.
406 sess.time("complete gated feature checking", || {
407 syntax::feature_gate::check_crate(
410 &sess.features_untracked(),
411 sess.opts.unstable_features,
415 // Add all buffered lints from the `ParseSess` to the `Session`.
416 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
417 info!("{} parse sess buffered_lints", buffered_lints.len());
418 for BufferedEarlyLint { id, span, msg, lint_id } in buffered_lints.drain(..) {
419 resolver.lint_buffer().buffer_lint(lint_id, id, span, &msg);
423 Ok((krate, resolver))
426 pub fn lower_to_hir<'res, 'tcx>(
428 lint_store: &lint::LintStore,
429 resolver: &'res mut Resolver<'_>,
430 dep_graph: &'res DepGraph,
431 krate: &'res ast::Crate,
432 arena: &'tcx Arena<'tcx>,
433 ) -> Result<map::Forest<'tcx>> {
435 let hir_forest = sess.time("lowering AST -> HIR", || {
436 let hir_crate = rustc_ast_lowering::lower_crate(
441 rustc_parse::nt_to_tokenstream,
445 if sess.opts.debugging_opts.hir_stats {
446 hir_stats::print_hir_stats(&hir_crate);
449 map::Forest::new(hir_crate, &dep_graph)
452 sess.time("early lint checks", || {
453 rustc_lint::check_ast_crate(
458 Some(std::mem::take(resolver.lint_buffer())),
459 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
463 // Discard hygiene data, which isn't required after lowering to HIR.
464 if !sess.opts.debugging_opts.keep_hygiene_data {
465 rustc_span::hygiene::clear_syntax_context_map();
471 // Returns all the paths that correspond to generated files.
472 fn generated_output_paths(
474 outputs: &OutputFilenames,
478 let mut out_filenames = Vec::new();
479 for output_type in sess.opts.output_types.keys() {
480 let file = outputs.path(*output_type);
482 // If the filename has been overridden using `-o`, it will not be modified
483 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
484 OutputType::Exe if !exact_name => {
485 for crate_type in sess.crate_types.borrow().iter() {
486 let p = ::rustc_codegen_utils::link::filename_for_input(
492 out_filenames.push(p);
495 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
496 // Don't add the dep-info output when omitting it from dep-info targets
499 out_filenames.push(file);
506 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
507 // returns None for every file path.
508 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
510 F: Fn(&PathBuf) -> Option<T>,
512 for output_path in output_paths {
513 if let Some(result) = f(output_path) {
520 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
521 let input_path = input_path.canonicalize().ok();
522 if input_path.is_none() {
525 let check = |output_path: &PathBuf| {
526 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
528 check_output(output_paths, check).is_some()
531 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
532 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
533 check_output(output_paths, check)
536 fn escape_dep_filename(filename: &FileName) -> String {
537 // Apparently clang and gcc *only* escape spaces:
538 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
539 filename.to_string().replace(" ", "\\ ")
544 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
545 outputs: &OutputFilenames,
546 out_filenames: &[PathBuf],
548 // Write out dependency rules to the dep-info file if requested
549 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
552 let deps_filename = outputs.path(OutputType::DepInfo);
554 let result = (|| -> io::Result<()> {
555 // Build a list of files used to compile the output and
556 // write Makefile-compatible dependency rules
557 let mut files: Vec<String> = sess
561 .filter(|fmap| fmap.is_real_file())
562 .filter(|fmap| !fmap.is_imported())
563 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
566 if sess.binary_dep_depinfo() {
567 boxed_resolver.borrow().borrow_mut().access(|resolver| {
568 for cnum in resolver.cstore().crates_untracked() {
569 let source = resolver.cstore().crate_source_untracked(cnum);
570 if let Some((path, _)) = source.dylib {
571 files.push(escape_dep_filename(&FileName::Real(path)));
573 if let Some((path, _)) = source.rlib {
574 files.push(escape_dep_filename(&FileName::Real(path)));
576 if let Some((path, _)) = source.rmeta {
577 files.push(escape_dep_filename(&FileName::Real(path)));
583 let mut file = fs::File::create(&deps_filename)?;
584 for path in out_filenames {
585 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
588 // Emit a fake target for each input file to the compilation. This
589 // prevents `make` from spitting out an error if a file is later
590 // deleted. For more info see #28735
592 writeln!(file, "{}:", path)?;
599 if sess.opts.json_artifact_notifications {
602 .emit_artifact_notification(&deps_filename, "dep-info");
605 Err(e) => sess.fatal(&format!(
606 "error writing dependencies to `{}`: {}",
607 deps_filename.display(),
613 pub fn prepare_outputs(
617 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
619 ) -> Result<OutputFilenames> {
620 // FIXME: rustdoc passes &[] instead of &krate.attrs here
621 let outputs = util::build_output_filenames(
623 &compiler.output_dir,
624 &compiler.output_file,
630 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
632 // Ensure the source file isn't accidentally overwritten during compilation.
633 if let Some(ref input_path) = compiler.input_path {
634 if sess.opts.will_create_output_file() {
635 if output_contains_path(&output_paths, input_path) {
637 "the input file \"{}\" would be overwritten by the generated \
641 return Err(ErrorReported);
643 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
645 "the generated executable for the input file \"{}\" conflicts with the \
646 existing directory \"{}\"",
647 input_path.display(),
650 return Err(ErrorReported);
655 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
657 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
658 && sess.opts.output_types.len() == 1;
661 if let Some(ref dir) = compiler.output_dir {
662 if fs::create_dir_all(dir).is_err() {
663 sess.err("failed to find or create the directory specified by `--out-dir`");
664 return Err(ErrorReported);
672 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
673 providers.analysis = analysis;
674 proc_macro_decls::provide(providers);
675 plugin::build::provide(providers);
676 rustc::hir::provide(providers);
677 mir::provide(providers);
678 rustc_privacy::provide(providers);
679 typeck::provide(providers);
680 ty::provide(providers);
681 traits::provide(providers);
682 rustc_passes::provide(providers);
683 rustc_resolve::provide(providers);
684 rustc_traits::provide(providers);
685 rustc_metadata::provide(providers);
686 rustc_lint::provide(providers);
687 rustc_codegen_utils::provide(providers);
688 rustc_codegen_ssa::provide(providers);
691 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
692 rustc_metadata::provide_extern(providers);
693 rustc_codegen_ssa::provide_extern(providers);
696 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
698 impl<'tcx> QueryContext<'tcx> {
699 pub fn enter<F, R>(&mut self, f: F) -> R
701 F: FnOnce(TyCtxt<'tcx>) -> R,
703 ty::tls::enter_global(self.0, |tcx| f(tcx))
706 pub fn print_stats(&self) {
707 self.0.queries.print_stats()
711 pub fn create_global_ctxt<'tcx>(
712 compiler: &'tcx Compiler,
713 lint_store: Lrc<lint::LintStore>,
714 hir_forest: &'tcx map::Forest<'tcx>,
715 mut resolver_outputs: ResolverOutputs,
716 outputs: OutputFilenames,
718 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
719 all_arenas: &'tcx AllArenas,
720 arena: &'tcx WorkerLocal<Arena<'tcx>>,
721 ) -> QueryContext<'tcx> {
722 let sess = &compiler.session();
723 let defs = mem::take(&mut resolver_outputs.definitions);
725 // Construct the HIR map.
726 let hir_map = sess.time("indexing HIR", || {
727 map::map_crate(sess, &*resolver_outputs.cstore, &hir_forest, defs)
730 let query_result_on_disk_cache =
731 sess.time("load query result cache", || rustc_incremental::load_query_result_cache(sess));
733 let codegen_backend = compiler.codegen_backend();
734 let mut local_providers = ty::query::Providers::default();
735 default_provide(&mut local_providers);
736 codegen_backend.provide(&mut local_providers);
738 let mut extern_providers = local_providers;
739 default_provide_extern(&mut extern_providers);
740 codegen_backend.provide_extern(&mut extern_providers);
742 if let Some(callback) = compiler.override_queries {
743 callback(sess, &mut local_providers, &mut extern_providers);
746 let gcx = global_ctxt.init_locking(|| {
747 TyCtxt::create_global_ctxt(
756 query_result_on_disk_cache,
762 // Do some initialization of the DepGraph that can only be done with the tcx available.
763 ty::tls::enter_global(&gcx, |tcx| {
764 tcx.sess.time("dep graph tcx init", || rustc_incremental::dep_graph_tcx_init(tcx));
770 /// Runs the resolution, type-checking, region checking and other
771 /// miscellaneous analysis passes on the crate.
772 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
773 assert_eq!(cnum, LOCAL_CRATE);
776 let mut entry_point = None;
778 sess.time("misc checking 1", || {
782 .time("looking for entry point", || rustc_passes::entry::find_entry_point(tcx));
784 sess.time("looking for plugin registrar", || {
785 plugin::build::find_plugin_registrar(tcx)
788 sess.time("looking for derive registrar", || proc_macro_decls::find(tcx));
791 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
792 let local_def_id = tcx.hir().local_def_id(module);
793 tcx.ensure().check_mod_loops(local_def_id);
794 tcx.ensure().check_mod_attrs(local_def_id);
795 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
796 tcx.ensure().check_mod_const_bodies(local_def_id);
802 // passes are timed inside typeck
803 typeck::check_crate(tcx)?;
805 sess.time("misc checking 2", || {
808 sess.time("match checking", || {
809 tcx.par_body_owners(|def_id| {
810 tcx.ensure().check_match(def_id);
815 sess.time("liveness checking + intrinsic checking", || {
816 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
817 // this must run before MIR dump, because
818 // "not all control paths return a value" is reported here.
820 // maybe move the check to a MIR pass?
821 let local_def_id = tcx.hir().local_def_id(module);
823 tcx.ensure().check_mod_liveness(local_def_id);
824 tcx.ensure().check_mod_intrinsics(local_def_id);
831 sess.time("MIR borrow checking", || {
832 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
835 sess.time("dumping Chalk-like clauses", || {
836 rustc_traits::lowering::dump_program_clauses(tcx);
839 sess.time("MIR effect checking", || {
840 for def_id in tcx.body_owners() {
841 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
845 sess.time("layout testing", || layout_test::test_layout(tcx));
847 // Avoid overwhelming user with errors if borrow checking failed.
848 // I'm not sure how helpful this is, to be honest, but it avoids a
849 // lot of annoying errors in the compile-fail tests (basically,
850 // lint warnings and so on -- kindck used to do this abort, but
851 // kindck is gone now). -nmatsakis
852 if sess.has_errors() {
853 return Err(ErrorReported);
856 sess.time("misc checking 3", || {
859 sess.time("privacy access levels", || {
860 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
864 sess.time("private in public", || {
865 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
914 .map(|ty| match *ty {
915 CrateType::Executable | CrateType::Staticlib | CrateType::Cdylib => MetadataKind::None,
917 CrateType::Rlib => MetadataKind::Uncompressed,
919 CrateType::Dylib | CrateType::ProcMacro => MetadataKind::Compressed,
922 .unwrap_or(MetadataKind::None);
924 let metadata = match metadata_kind {
925 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
926 MetadataKind::Uncompressed | MetadataKind::Compressed => tcx.encode_metadata(),
929 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
930 if need_metadata_file {
931 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
932 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
933 // To avoid races with another rustc process scanning the output directory,
934 // we need to write the file somewhere else and atomically move it to its
935 // final destination, with an `fs::rename` call. In order for the rename to
936 // always succeed, the temporary file needs to be on the same filesystem,
937 // which is why we create it inside the output directory specifically.
938 let metadata_tmpdir = TempFileBuilder::new()
940 .tempdir_in(out_filename.parent().unwrap())
941 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
942 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
943 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
944 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
946 if tcx.sess.opts.json_artifact_notifications {
950 .emit_artifact_notification(&out_filename, "metadata");
954 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
956 (metadata, need_metadata_module)
959 /// Runs the codegen backend, after which the AST and analysis can
961 pub fn start_codegen<'tcx>(
962 codegen_backend: &dyn CodegenBackend,
964 outputs: &OutputFilenames,
966 if log_enabled!(::log::Level::Info) {
967 println!("Pre-codegen");
968 tcx.print_debug_stats();
971 let (metadata, need_metadata_module) =
972 tcx.sess.time("metadata encoding and writing", || encode_and_write_metadata(tcx, outputs));
974 let codegen = tcx.sess.time("codegen", 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();