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, 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;
30 use rustc_lint::LintStore;
32 use rustc_mir_build as mir_build;
33 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
34 use rustc_passes::{self, hir_stats, layout_test};
35 use rustc_plugin_impl as plugin;
37 use rustc_resolve::{Resolver, ResolverArenas};
38 use rustc_span::symbol::Symbol;
39 use rustc_span::FileName;
41 use rustc_typeck as typeck;
42 use syntax::mut_visit::MutVisitor;
43 use syntax::util::node_count::NodeCounter;
44 use syntax::{self, ast, visit};
46 use rustc_serialize::json;
47 use tempfile::Builder as TempFileBuilder;
50 use std::cell::RefCell;
51 use std::ffi::OsString;
52 use std::io::{self, Write};
53 use std::path::PathBuf;
55 use std::{env, fs, iter, mem};
57 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
58 let krate = sess.time("parse_crate", || match input {
59 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
60 Input::Str { input, name } => {
61 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
65 if sess.opts.debugging_opts.ast_json_noexpand {
66 println!("{}", json::as_json(&krate));
69 if sess.opts.debugging_opts.input_stats {
70 println!("Lines of code: {}", sess.source_map().count_lines());
71 println!("Pre-expansion node count: {}", count_nodes(&krate));
74 if let Some(ref s) = sess.opts.debugging_opts.show_span {
75 rustc_ast_passes::show_span::run(sess.diagnostic(), s, &krate);
78 if sess.opts.debugging_opts.hir_stats {
79 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
85 fn count_nodes(krate: &ast::Crate) -> usize {
86 let mut counter = NodeCounter::new();
87 visit::walk_crate(&mut counter, krate);
91 declare_box_region_type!(
94 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
97 /// Runs the "early phases" of the compiler: initial `cfg` processing, loading compiler plugins,
98 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
99 /// harness if one is to be provided, injection of a dependency on the
100 /// standard library and prelude, and name resolution.
102 /// Returns `None` if we're aborting after handling -W help.
103 pub fn configure_and_expand(
105 lint_store: Lrc<LintStore>,
106 metadata_loader: Box<MetadataLoaderDyn>,
109 ) -> Result<(ast::Crate, BoxedResolver)> {
110 // Currently, we ignore the name resolution data structures for the purposes of dependency
111 // tracking. Instead we will run name resolution and include its output in the hash of each
112 // item, much like we do for macro expansion. In other words, the hash reflects not just
113 // its contents but the results of name resolution on those contents. Hopefully we'll push
114 // this back at some point.
115 let crate_name = crate_name.to_string();
116 let (result, resolver) = BoxedResolver::new(static move || {
118 let resolver_arenas = Resolver::arenas();
119 let res = configure_and_expand_inner(
127 let mut resolver = match res {
129 yield BoxedResolver::initial_yield(Err(v));
132 Ok((krate, resolver)) => {
133 yield BoxedResolver::initial_yield(Ok(krate));
137 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver));
138 resolver.into_outputs()
140 result.map(|k| (k, resolver))
144 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
145 match Rc::try_unwrap(resolver) {
146 Ok(resolver) => resolver.into_inner().complete(),
147 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
152 pub fn register_plugins<'a>(
154 metadata_loader: &'a dyn MetadataLoader,
155 register_lints: impl Fn(&Session, &mut LintStore),
156 mut krate: ast::Crate,
158 ) -> Result<(ast::Crate, Lrc<LintStore>)> {
159 krate = sess.time("attributes_injection", || {
160 rustc_builtin_macros::cmdline_attrs::inject(
163 &sess.opts.debugging_opts.crate_attr,
167 let (krate, features) = rustc_expand::config::features(
171 &sess.opts.debugging_opts.allow_features,
173 // these need to be set "early" so that expansion sees `quote` if enabled.
174 sess.init_features(features);
176 let crate_types = util::collect_crate_types(sess, &krate.attrs);
177 sess.crate_types.set(crate_types);
179 let disambiguator = util::compute_crate_disambiguator(sess);
180 sess.crate_disambiguator.set(disambiguator);
181 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
183 if sess.opts.incremental.is_some() {
184 sess.time("incr_comp_garbage_collect_session_directories", || {
185 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
187 "Error while trying to garbage collect incremental \
188 compilation cache directory: {}",
195 sess.time("recursion_limit", || {
196 middle::recursion_limit::update_limits(sess, &krate);
199 let mut lint_store = rustc_lint::new_lint_store(
200 sess.opts.debugging_opts.no_interleave_lints,
201 sess.unstable_options(),
203 register_lints(&sess, &mut lint_store);
206 sess.time("plugin_loading", || plugin::load::load_plugins(sess, metadata_loader, &krate));
207 sess.time("plugin_registration", || {
208 let mut registry = plugin::Registry { lint_store: &mut lint_store };
209 for registrar in registrars {
210 registrar(&mut registry);
214 Ok((krate, Lrc::new(lint_store)))
217 fn configure_and_expand_inner<'a>(
219 lint_store: &'a LintStore,
220 mut krate: ast::Crate,
222 resolver_arenas: &'a ResolverArenas<'a>,
223 metadata_loader: &'a MetadataLoaderDyn,
224 ) -> Result<(ast::Crate, Resolver<'a>)> {
225 sess.time("pre_AST_expansion_lint_checks", || {
226 rustc_lint::check_ast_crate(
232 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
236 let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
237 rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
239 krate = sess.time("crate_injection", || {
240 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
241 let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
247 if let Some(name) = name {
248 sess.parse_sess.injected_crate_name.set(name);
253 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
256 krate = sess.time("macro_expand_crate", || {
257 // Windows dlls do not have rpaths, so they don't know how to find their
258 // dependencies. It's up to us to tell the system where to find all the
259 // dependent dlls. Note that this uses cfg!(windows) as opposed to
260 // targ_cfg because syntax extensions are always loaded for the host
261 // compiler, not for the target.
263 // This is somewhat of an inherently racy operation, however, as
264 // multiple threads calling this function could possibly continue
265 // extending PATH far beyond what it should. To solve this for now we
266 // just don't add any new elements to PATH which are already there
267 // within PATH. This is basically a targeted fix at #17360 for rustdoc
268 // which runs rustc in parallel but has been seen (#33844) to cause
269 // problems with PATH becoming too long.
270 let mut old_path = OsString::new();
272 old_path = env::var_os("PATH").unwrap_or(old_path);
273 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
274 for path in env::split_paths(&old_path) {
275 if !new_path.contains(&path) {
282 new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
288 // Create the config for macro expansion
289 let features = sess.features_untracked();
290 let cfg = rustc_expand::expand::ExpansionConfig {
291 features: Some(&features),
292 recursion_limit: *sess.recursion_limit.get(),
293 trace_mac: sess.opts.debugging_opts.trace_macros,
294 should_test: sess.opts.test,
295 ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
298 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
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 for span in missing_fragment_specifiers {
314 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
315 let msg = "missing fragment specifier";
316 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
319 env::set_var("PATH", &old_path);
324 sess.time("maybe_building_test_harness", || {
325 rustc_builtin_macros::test_harness::inject(
331 &sess.features_untracked(),
332 sess.panic_strategy(),
333 sess.target.target.options.panic_strategy,
334 sess.opts.debugging_opts.panic_abort_tests,
338 // If we're actually rustdoc then there's no need to actually compile
339 // anything, so switch everything to just looping
340 let mut should_loop = sess.opts.actually_rustdoc;
341 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
345 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
348 let has_proc_macro_decls = sess.time("AST_validation", || {
349 rustc_ast_passes::ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
352 let crate_types = sess.crate_types.borrow();
353 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
355 // For backwards compatibility, we don't try to run proc macro injection
356 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
357 // specified. This should only affect users who manually invoke 'rustdoc', as
358 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
359 // However, we do emit a warning, to let such users know that they should
360 // start passing '--crate-type proc-macro'
361 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
362 let mut msg = sess.diagnostic().struct_warn(
363 &"Trying to document proc macro crate \
364 without passing '--crate-type proc-macro to rustdoc",
367 msg.warn("The generated documentation may be incorrect");
370 krate = sess.time("maybe_create_a_macro_crate", || {
371 let num_crate_types = crate_types.len();
372 let is_test_crate = sess.opts.test;
373 rustc_builtin_macros::proc_macro_harness::inject(
378 has_proc_macro_decls,
386 // Done with macro expansion!
388 if sess.opts.debugging_opts.input_stats {
389 println!("Post-expansion node count: {}", count_nodes(&krate));
392 if sess.opts.debugging_opts.hir_stats {
393 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
396 if sess.opts.debugging_opts.ast_json {
397 println!("{}", json::as_json(&krate));
400 resolver.resolve_crate(&krate);
402 // Needs to go *after* expansion to be able to check the results of macro expansion.
403 sess.time("complete_gated_feature_checking", || {
404 rustc_ast_passes::feature_gate::check_crate(
407 &sess.features_untracked(),
408 sess.opts.unstable_features,
412 // Add all buffered lints from the `ParseSess` to the `Session`.
413 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
414 info!("{} parse sess buffered_lints", buffered_lints.len());
415 for early_lint in buffered_lints.drain(..) {
416 resolver.lint_buffer().add_early_lint(early_lint);
420 Ok((krate, resolver))
423 pub fn lower_to_hir<'res, 'tcx>(
425 lint_store: &LintStore,
426 resolver: &'res mut Resolver<'_>,
427 dep_graph: &'res DepGraph,
428 krate: &'res ast::Crate,
429 arena: &'tcx Arena<'tcx>,
430 ) -> Result<map::Forest<'tcx>> {
432 let hir_crate = rustc_ast_lowering::lower_crate(
437 rustc_parse::nt_to_tokenstream,
441 if sess.opts.debugging_opts.hir_stats {
442 hir_stats::print_hir_stats(&hir_crate);
445 let hir_forest = map::Forest::new(hir_crate, &dep_graph);
447 sess.time("early_lint_checks", || {
448 rustc_lint::check_ast_crate(
453 Some(std::mem::take(resolver.lint_buffer())),
454 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
458 // Discard hygiene data, which isn't required after lowering to HIR.
459 if !sess.opts.debugging_opts.keep_hygiene_data {
460 rustc_span::hygiene::clear_syntax_context_map();
466 // Returns all the paths that correspond to generated files.
467 fn generated_output_paths(
469 outputs: &OutputFilenames,
473 let mut out_filenames = Vec::new();
474 for output_type in sess.opts.output_types.keys() {
475 let file = outputs.path(*output_type);
477 // If the filename has been overridden using `-o`, it will not be modified
478 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
479 OutputType::Exe if !exact_name => {
480 for crate_type in sess.crate_types.borrow().iter() {
481 let p = ::rustc_codegen_utils::link::filename_for_input(
487 out_filenames.push(p);
490 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
491 // Don't add the dep-info output when omitting it from dep-info targets
494 out_filenames.push(file);
501 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
502 // returns None for every file path.
503 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
505 F: Fn(&PathBuf) -> Option<T>,
507 for output_path in output_paths {
508 if let Some(result) = f(output_path) {
515 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
516 let input_path = input_path.canonicalize().ok();
517 if input_path.is_none() {
520 let check = |output_path: &PathBuf| {
521 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
523 check_output(output_paths, check).is_some()
526 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
527 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
528 check_output(output_paths, check)
531 fn escape_dep_filename(filename: &FileName) -> String {
532 // Apparently clang and gcc *only* escape spaces:
533 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
534 filename.to_string().replace(" ", "\\ ")
539 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
540 outputs: &OutputFilenames,
541 out_filenames: &[PathBuf],
543 // Write out dependency rules to the dep-info file if requested
544 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
547 let deps_filename = outputs.path(OutputType::DepInfo);
549 let result = (|| -> io::Result<()> {
550 // Build a list of files used to compile the output and
551 // write Makefile-compatible dependency rules
552 let mut files: Vec<String> = sess
556 .filter(|fmap| fmap.is_real_file())
557 .filter(|fmap| !fmap.is_imported())
558 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
561 if sess.binary_dep_depinfo() {
562 boxed_resolver.borrow().borrow_mut().access(|resolver| {
563 for cnum in resolver.cstore().crates_untracked() {
564 let source = resolver.cstore().crate_source_untracked(cnum);
565 if let Some((path, _)) = source.dylib {
566 files.push(escape_dep_filename(&FileName::Real(path)));
568 if let Some((path, _)) = source.rlib {
569 files.push(escape_dep_filename(&FileName::Real(path)));
571 if let Some((path, _)) = source.rmeta {
572 files.push(escape_dep_filename(&FileName::Real(path)));
578 let mut file = fs::File::create(&deps_filename)?;
579 for path in out_filenames {
580 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
583 // Emit a fake target for each input file to the compilation. This
584 // prevents `make` from spitting out an error if a file is later
585 // deleted. For more info see #28735
587 writeln!(file, "{}:", path)?;
594 if sess.opts.json_artifact_notifications {
597 .emit_artifact_notification(&deps_filename, "dep-info");
600 Err(e) => sess.fatal(&format!(
601 "error writing dependencies to `{}`: {}",
602 deps_filename.display(),
608 pub fn prepare_outputs(
612 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
614 ) -> Result<OutputFilenames> {
615 let _timer = sess.timer("prepare_outputs");
617 // FIXME: rustdoc passes &[] instead of &krate.attrs here
618 let outputs = util::build_output_filenames(
620 &compiler.output_dir,
621 &compiler.output_file,
627 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
629 // Ensure the source file isn't accidentally overwritten during compilation.
630 if let Some(ref input_path) = compiler.input_path {
631 if sess.opts.will_create_output_file() {
632 if output_contains_path(&output_paths, input_path) {
634 "the input file \"{}\" would be overwritten by the generated \
638 return Err(ErrorReported);
640 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
642 "the generated executable for the input file \"{}\" conflicts with the \
643 existing directory \"{}\"",
644 input_path.display(),
647 return Err(ErrorReported);
652 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
654 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
655 && sess.opts.output_types.len() == 1;
658 if let Some(ref dir) = compiler.output_dir {
659 if fs::create_dir_all(dir).is_err() {
660 sess.err("failed to find or create the directory specified by `--out-dir`");
661 return Err(ErrorReported);
669 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
670 providers.analysis = analysis;
671 proc_macro_decls::provide(providers);
672 plugin::build::provide(providers);
673 rustc::hir::provide(providers);
674 mir::provide(providers);
675 mir_build::provide(providers);
676 rustc_privacy::provide(providers);
677 typeck::provide(providers);
678 ty::provide(providers);
679 traits::provide(providers);
680 rustc_passes::provide(providers);
681 rustc_resolve::provide(providers);
682 rustc_traits::provide(providers);
683 rustc_ty::provide(providers);
684 rustc_metadata::provide(providers);
685 rustc_lint::provide(providers);
686 rustc_codegen_utils::provide(providers);
687 rustc_codegen_ssa::provide(providers);
690 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
691 rustc_metadata::provide_extern(providers);
692 rustc_codegen_ssa::provide_extern(providers);
695 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
697 impl<'tcx> QueryContext<'tcx> {
698 pub fn enter<F, R>(&mut self, f: F) -> R
700 F: FnOnce(TyCtxt<'tcx>) -> R,
702 ty::tls::enter_global(self.0, |tcx| f(tcx))
705 pub fn print_stats(&self) {
706 self.0.queries.print_stats()
710 pub fn create_global_ctxt<'tcx>(
711 compiler: &'tcx Compiler,
712 lint_store: Lrc<LintStore>,
713 hir_forest: &'tcx map::Forest<'tcx>,
714 mut resolver_outputs: ResolverOutputs,
715 outputs: OutputFilenames,
717 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
718 arena: &'tcx WorkerLocal<Arena<'tcx>>,
719 ) -> QueryContext<'tcx> {
720 let sess = &compiler.session();
721 let defs = mem::take(&mut resolver_outputs.definitions);
723 // Construct the HIR map.
724 let hir_map = map::map_crate(sess, &*resolver_outputs.cstore, &hir_forest, defs);
726 let query_result_on_disk_cache = rustc_incremental::load_query_result_cache(sess);
728 let codegen_backend = compiler.codegen_backend();
729 let mut local_providers = ty::query::Providers::default();
730 default_provide(&mut local_providers);
731 codegen_backend.provide(&mut local_providers);
733 let mut extern_providers = local_providers;
734 default_provide_extern(&mut extern_providers);
735 codegen_backend.provide_extern(&mut extern_providers);
737 if let Some(callback) = compiler.override_queries {
738 callback(sess, &mut local_providers, &mut extern_providers);
741 let gcx = sess.time("setup_global_ctxt", || {
742 global_ctxt.init_locking(|| {
743 TyCtxt::create_global_ctxt(
751 query_result_on_disk_cache,
758 // Do some initialization of the DepGraph that can only be done with the tcx available.
759 ty::tls::enter_global(&gcx, |tcx| {
760 tcx.sess.time("dep_graph_tcx_init", || rustc_incremental::dep_graph_tcx_init(tcx));
766 /// Runs the resolution, type-checking, region checking and other
767 /// miscellaneous analysis passes on the crate.
768 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
769 assert_eq!(cnum, LOCAL_CRATE);
772 let mut entry_point = None;
774 sess.time("misc_checking_1", || {
778 .time("looking_for_entry_point", || rustc_passes::entry::find_entry_point(tcx));
780 sess.time("looking_for_plugin_registrar", || {
781 plugin::build::find_plugin_registrar(tcx)
784 sess.time("looking_for_derive_registrar", || proc_macro_decls::find(tcx));
787 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
788 let local_def_id = tcx.hir().local_def_id(module);
789 tcx.ensure().check_mod_loops(local_def_id);
790 tcx.ensure().check_mod_attrs(local_def_id);
791 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
792 tcx.ensure().check_mod_const_bodies(local_def_id);
798 // passes are timed inside typeck
799 typeck::check_crate(tcx)?;
801 sess.time("misc_checking_2", || {
804 sess.time("match_checking", || {
805 tcx.par_body_owners(|def_id| {
806 tcx.ensure().check_match(def_id);
811 sess.time("liveness_and_intrinsic_checking", || {
812 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
813 // this must run before MIR dump, because
814 // "not all control paths return a value" is reported here.
816 // maybe move the check to a MIR pass?
817 let local_def_id = tcx.hir().local_def_id(module);
819 tcx.ensure().check_mod_liveness(local_def_id);
820 tcx.ensure().check_mod_intrinsics(local_def_id);
827 sess.time("MIR_borrow_checking", || {
828 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
831 sess.time("dumping_chalk_like_clauses", || {
832 rustc_traits::lowering::dump_program_clauses(tcx);
835 sess.time("MIR_effect_checking", || {
836 for def_id in tcx.body_owners() {
837 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
841 sess.time("layout_testing", || layout_test::test_layout(tcx));
843 // Avoid overwhelming user with errors if borrow checking failed.
844 // I'm not sure how helpful this is, to be honest, but it avoids a
845 // lot of annoying errors in the compile-fail tests (basically,
846 // lint warnings and so on -- kindck used to do this abort, but
847 // kindck is gone now). -nmatsakis
848 if sess.has_errors() {
849 return Err(ErrorReported);
852 sess.time("misc_checking_3", || {
855 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
859 tcx.ensure().check_private_in_public(LOCAL_CRATE);
862 sess.time("death_checking", || rustc_passes::dead::check_crate(tcx));
865 sess.time("unused_lib_feature_checking", || {
866 rustc_passes::stability::check_unused_or_stable_features(tcx)
870 sess.time("lint_checking", || {
871 rustc_lint::check_crate(tcx, || {
872 rustc_lint::BuiltinCombinedLateLintPass::new()
879 sess.time("privacy_checking_modules", || {
880 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
881 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
891 fn encode_and_write_metadata(
893 outputs: &OutputFilenames,
894 ) -> (middle::cstore::EncodedMetadata, bool) {
895 #[derive(PartialEq, Eq, PartialOrd, Ord)]
902 let metadata_kind = tcx
907 .map(|ty| match *ty {
908 CrateType::Executable | CrateType::Staticlib | CrateType::Cdylib => MetadataKind::None,
910 CrateType::Rlib => MetadataKind::Uncompressed,
912 CrateType::Dylib | CrateType::ProcMacro => MetadataKind::Compressed,
915 .unwrap_or(MetadataKind::None);
917 let metadata = match metadata_kind {
918 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
919 MetadataKind::Uncompressed | MetadataKind::Compressed => tcx.encode_metadata(),
922 let _prof_timer = tcx.sess.prof.generic_activity("write_crate_metadata");
924 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
925 if need_metadata_file {
926 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
927 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
928 // To avoid races with another rustc process scanning the output directory,
929 // we need to write the file somewhere else and atomically move it to its
930 // final destination, with an `fs::rename` call. In order for the rename to
931 // always succeed, the temporary file needs to be on the same filesystem,
932 // which is why we create it inside the output directory specifically.
933 let metadata_tmpdir = TempFileBuilder::new()
935 .tempdir_in(out_filename.parent().unwrap())
936 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
937 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
938 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
939 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
941 if tcx.sess.opts.json_artifact_notifications {
945 .emit_artifact_notification(&out_filename, "metadata");
949 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
951 (metadata, need_metadata_module)
954 /// Runs the codegen backend, after which the AST and analysis can
956 pub fn start_codegen<'tcx>(
957 codegen_backend: &dyn CodegenBackend,
959 outputs: &OutputFilenames,
961 if log_enabled!(::log::Level::Info) {
962 println!("Pre-codegen");
963 tcx.print_debug_stats();
966 let (metadata, need_metadata_module) = encode_and_write_metadata(tcx, outputs);
968 let codegen = tcx.sess.time("codegen_crate", move || {
969 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
972 if log_enabled!(::log::Level::Info) {
973 println!("Post-codegen");
974 tcx.print_debug_stats();
977 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
978 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
979 tcx.sess.err(&format!("could not emit MIR: {}", e));
980 tcx.sess.abort_if_errors();