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("parse_crate", || 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) = sess.time("compute_features", || {
167 rustc_expand::config::features(
171 &sess.opts.debugging_opts.allow_features,
174 // these need to be set "early" so that expansion sees `quote` if enabled.
175 sess.init_features(features);
177 let crate_types = util::collect_crate_types(sess, &krate.attrs);
178 sess.crate_types.set(crate_types);
181 sess.time("compute_crate_disambiguator", || util::compute_crate_disambiguator(sess));
182 sess.crate_disambiguator.set(disambiguator);
183 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
185 if sess.opts.incremental.is_some() {
186 sess.time("incr_comp_garbage_collect_session_directories", || {
187 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
189 "Error while trying to garbage collect incremental \
190 compilation cache directory: {}",
197 sess.time("recursion_limit", || {
198 middle::recursion_limit::update_limits(sess, &krate);
201 let mut lint_store = rustc_lint::new_lint_store(
202 sess.opts.debugging_opts.no_interleave_lints,
203 sess.unstable_options(),
205 register_lints(&sess, &mut lint_store);
208 sess.time("plugin_loading", || plugin::load::load_plugins(sess, metadata_loader, &krate));
209 sess.time("plugin_registration", || {
210 let mut registry = plugin::Registry { lint_store: &mut lint_store };
211 for registrar in registrars {
212 registrar(&mut registry);
216 Ok((krate, Lrc::new(lint_store)))
219 fn configure_and_expand_inner<'a>(
221 lint_store: &'a lint::LintStore,
222 mut krate: ast::Crate,
224 resolver_arenas: &'a ResolverArenas<'a>,
225 metadata_loader: &'a MetadataLoaderDyn,
226 ) -> Result<(ast::Crate, Resolver<'a>)> {
227 sess.time("pre_AST_expansion_lint_checks", || {
228 rustc_lint::check_ast_crate(
234 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
238 let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
239 rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
241 krate = sess.time("crate_injection", || {
242 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
243 let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
249 if let Some(name) = name {
250 sess.parse_sess.injected_crate_name.set(name);
255 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
258 krate = sess.time("macro_expand_crate", || {
259 // Windows dlls do not have rpaths, so they don't know how to find their
260 // dependencies. It's up to us to tell the system where to find all the
261 // dependent dlls. Note that this uses cfg!(windows) as opposed to
262 // targ_cfg because syntax extensions are always loaded for the host
263 // compiler, not for the target.
265 // This is somewhat of an inherently racy operation, however, as
266 // multiple threads calling this function could possibly continue
267 // extending PATH far beyond what it should. To solve this for now we
268 // just don't add any new elements to PATH which are already there
269 // within PATH. This is basically a targeted fix at #17360 for rustdoc
270 // which runs rustc in parallel but has been seen (#33844) to cause
271 // problems with PATH becoming too long.
272 let mut old_path = OsString::new();
274 old_path = env::var_os("PATH").unwrap_or(old_path);
275 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
276 for path in env::split_paths(&old_path) {
277 if !new_path.contains(&path) {
284 new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
290 // Create the config for macro expansion
291 let features = sess.features_untracked();
292 let cfg = rustc_expand::expand::ExpansionConfig {
293 features: Some(&features),
294 recursion_limit: *sess.recursion_limit.get(),
295 trace_mac: sess.opts.debugging_opts.trace_macros,
296 should_test: sess.opts.test,
297 ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
300 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
302 // Expand macros now!
303 let krate = sess.time("expand_crate", || ecx.monotonic_expander().expand_crate(krate));
305 // The rest is error reporting
307 sess.time("check_unused_macros", || {
308 ecx.check_unused_macros();
311 let mut missing_fragment_specifiers: Vec<_> =
312 ecx.parse_sess.missing_fragment_specifiers.borrow().iter().cloned().collect();
313 missing_fragment_specifiers.sort();
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);
326 sess.time("maybe_building_test_harness", || {
327 rustc_builtin_macros::test_harness::inject(
333 &sess.features_untracked(),
334 sess.panic_strategy(),
335 sess.target.target.options.panic_strategy,
336 sess.opts.debugging_opts.panic_abort_tests,
340 // If we're actually rustdoc then there's no need to actually compile
341 // anything, so switch everything to just looping
342 let mut should_loop = sess.opts.actually_rustdoc;
343 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
347 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
350 let has_proc_macro_decls = sess.time("AST_validation", || {
351 ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
354 let crate_types = sess.crate_types.borrow();
355 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
357 // For backwards compatibility, we don't try to run proc macro injection
358 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
359 // specified. This should only affect users who manually invoke 'rustdoc', as
360 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
361 // However, we do emit a warning, to let such users know that they should
362 // start passing '--crate-type proc-macro'
363 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
364 let mut msg = sess.diagnostic().struct_warn(
365 &"Trying to document proc macro crate \
366 without passing '--crate-type proc-macro to rustdoc",
369 msg.warn("The generated documentation may be incorrect");
372 krate = sess.time("maybe_create_a_macro_crate", || {
373 let num_crate_types = crate_types.len();
374 let is_test_crate = sess.opts.test;
375 rustc_builtin_macros::proc_macro_harness::inject(
380 has_proc_macro_decls,
388 // Done with macro expansion!
390 if sess.opts.debugging_opts.input_stats {
391 println!("Post-expansion node count: {}", count_nodes(&krate));
394 if sess.opts.debugging_opts.hir_stats {
395 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
398 if sess.opts.debugging_opts.ast_json {
399 println!("{}", json::as_json(&krate));
402 resolver.resolve_crate(&krate);
404 // Needs to go *after* expansion to be able to check the results of macro expansion.
405 sess.time("complete_gated_feature_checking", || {
406 syntax::feature_gate::check_crate(
409 &sess.features_untracked(),
410 sess.opts.unstable_features,
414 // Add all buffered lints from the `ParseSess` to the `Session`.
415 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
416 info!("{} parse sess buffered_lints", buffered_lints.len());
417 for BufferedEarlyLint { id, span, msg, lint_id } in buffered_lints.drain(..) {
418 resolver.lint_buffer().buffer_lint(lint_id, id, span, &msg);
422 Ok((krate, resolver))
425 pub fn lower_to_hir<'res, 'tcx>(
427 lint_store: &lint::LintStore,
428 resolver: &'res mut Resolver<'_>,
429 dep_graph: &'res DepGraph,
430 krate: &'res ast::Crate,
431 arena: &'tcx Arena<'tcx>,
432 ) -> Result<map::Forest<'tcx>> {
434 let hir_crate = rustc_ast_lowering::lower_crate(
439 rustc_parse::nt_to_tokenstream,
443 if sess.opts.debugging_opts.hir_stats {
444 hir_stats::print_hir_stats(&hir_crate);
447 let hir_forest = map::Forest::new(hir_crate, &dep_graph);
449 sess.time("early_lint_checks", || {
450 rustc_lint::check_ast_crate(
455 Some(std::mem::take(resolver.lint_buffer())),
456 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
460 // Discard hygiene data, which isn't required after lowering to HIR.
461 if !sess.opts.debugging_opts.keep_hygiene_data {
462 rustc_span::hygiene::clear_syntax_context_map();
468 // Returns all the paths that correspond to generated files.
469 fn generated_output_paths(
471 outputs: &OutputFilenames,
475 let mut out_filenames = Vec::new();
476 for output_type in sess.opts.output_types.keys() {
477 let file = outputs.path(*output_type);
479 // If the filename has been overridden using `-o`, it will not be modified
480 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
481 OutputType::Exe if !exact_name => {
482 for crate_type in sess.crate_types.borrow().iter() {
483 let p = ::rustc_codegen_utils::link::filename_for_input(
489 out_filenames.push(p);
492 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
493 // Don't add the dep-info output when omitting it from dep-info targets
496 out_filenames.push(file);
503 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
504 // returns None for every file path.
505 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
507 F: Fn(&PathBuf) -> Option<T>,
509 for output_path in output_paths {
510 if let Some(result) = f(output_path) {
517 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
518 let input_path = input_path.canonicalize().ok();
519 if input_path.is_none() {
522 let check = |output_path: &PathBuf| {
523 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
525 check_output(output_paths, check).is_some()
528 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
529 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
530 check_output(output_paths, check)
533 fn escape_dep_filename(filename: &FileName) -> String {
534 // Apparently clang and gcc *only* escape spaces:
535 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
536 filename.to_string().replace(" ", "\\ ")
541 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
542 outputs: &OutputFilenames,
543 out_filenames: &[PathBuf],
545 // Write out dependency rules to the dep-info file if requested
546 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
549 let deps_filename = outputs.path(OutputType::DepInfo);
551 let result = (|| -> io::Result<()> {
552 // Build a list of files used to compile the output and
553 // write Makefile-compatible dependency rules
554 let mut files: Vec<String> = sess
558 .filter(|fmap| fmap.is_real_file())
559 .filter(|fmap| !fmap.is_imported())
560 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
563 if sess.binary_dep_depinfo() {
564 boxed_resolver.borrow().borrow_mut().access(|resolver| {
565 for cnum in resolver.cstore().crates_untracked() {
566 let source = resolver.cstore().crate_source_untracked(cnum);
567 if let Some((path, _)) = source.dylib {
568 files.push(escape_dep_filename(&FileName::Real(path)));
570 if let Some((path, _)) = source.rlib {
571 files.push(escape_dep_filename(&FileName::Real(path)));
573 if let Some((path, _)) = source.rmeta {
574 files.push(escape_dep_filename(&FileName::Real(path)));
580 let mut file = fs::File::create(&deps_filename)?;
581 for path in out_filenames {
582 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
585 // Emit a fake target for each input file to the compilation. This
586 // prevents `make` from spitting out an error if a file is later
587 // deleted. For more info see #28735
589 writeln!(file, "{}:", path)?;
596 if sess.opts.json_artifact_notifications {
599 .emit_artifact_notification(&deps_filename, "dep-info");
602 Err(e) => sess.fatal(&format!(
603 "error writing dependencies to `{}`: {}",
604 deps_filename.display(),
610 pub fn prepare_outputs(
614 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
616 ) -> Result<OutputFilenames> {
617 let _timer = sess.timer("prepare_outputs");
619 // FIXME: rustdoc passes &[] instead of &krate.attrs here
620 let outputs = util::build_output_filenames(
622 &compiler.output_dir,
623 &compiler.output_file,
629 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
631 // Ensure the source file isn't accidentally overwritten during compilation.
632 if let Some(ref input_path) = compiler.input_path {
633 if sess.opts.will_create_output_file() {
634 if output_contains_path(&output_paths, input_path) {
636 "the input file \"{}\" would be overwritten by the generated \
640 return Err(ErrorReported);
642 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
644 "the generated executable for the input file \"{}\" conflicts with the \
645 existing directory \"{}\"",
646 input_path.display(),
649 return Err(ErrorReported);
654 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
656 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
657 && sess.opts.output_types.len() == 1;
660 if let Some(ref dir) = compiler.output_dir {
661 if fs::create_dir_all(dir).is_err() {
662 sess.err("failed to find or create the directory specified by `--out-dir`");
663 return Err(ErrorReported);
671 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
672 providers.analysis = analysis;
673 proc_macro_decls::provide(providers);
674 plugin::build::provide(providers);
675 rustc::hir::provide(providers);
676 mir::provide(providers);
677 rustc_privacy::provide(providers);
678 typeck::provide(providers);
679 ty::provide(providers);
680 traits::provide(providers);
681 rustc_passes::provide(providers);
682 rustc_resolve::provide(providers);
683 rustc_traits::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<lint::LintStore>,
713 hir_forest: &'tcx map::Forest<'tcx>,
714 mut resolver_outputs: ResolverOutputs,
715 outputs: OutputFilenames,
717 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
718 all_arenas: &'tcx AllArenas,
719 arena: &'tcx WorkerLocal<Arena<'tcx>>,
720 ) -> QueryContext<'tcx> {
721 let sess = &compiler.session();
722 let defs = mem::take(&mut resolver_outputs.definitions);
724 // Construct the HIR map.
725 let hir_map = map::map_crate(sess, &*resolver_outputs.cstore, &hir_forest, defs);
727 let query_result_on_disk_cache = rustc_incremental::load_query_result_cache(sess);
729 let codegen_backend = sess.time("load_codegen_backend", || compiler.codegen_backend());
731 let (local_providers, extern_providers) = sess.time("load_codegen_backend", || {
732 let mut local_providers = ty::query::Providers::default();
733 default_provide(&mut local_providers);
734 codegen_backend.provide(&mut local_providers);
736 let mut extern_providers = local_providers;
737 default_provide_extern(&mut extern_providers);
738 codegen_backend.provide_extern(&mut extern_providers);
740 if let Some(callback) = compiler.override_queries {
741 callback(sess, &mut local_providers, &mut extern_providers);
744 (local_providers, extern_providers)
747 let gcx = sess.time("setup_global_ctxt", || {
748 global_ctxt.init_locking(|| {
749 TyCtxt::create_global_ctxt(
758 query_result_on_disk_cache,
765 // Do some initialization of the DepGraph that can only be done with the tcx available.
766 ty::tls::enter_global(&gcx, |tcx| {
767 tcx.sess.time("dep_graph_tcx_init", || rustc_incremental::dep_graph_tcx_init(tcx));
773 /// Runs the resolution, type-checking, region checking and other
774 /// miscellaneous analysis passes on the crate.
775 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
776 assert_eq!(cnum, LOCAL_CRATE);
779 let mut entry_point = None;
781 sess.time("misc_checking_1", || {
785 .time("looking_for_entry_point", || rustc_passes::entry::find_entry_point(tcx));
787 sess.time("looking_for_plugin_registrar", || {
788 plugin::build::find_plugin_registrar(tcx)
791 sess.time("looking_for_derive_registrar", || proc_macro_decls::find(tcx));
794 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
795 let local_def_id = tcx.hir().local_def_id(module);
796 tcx.ensure().check_mod_loops(local_def_id);
797 tcx.ensure().check_mod_attrs(local_def_id);
798 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
799 tcx.ensure().check_mod_const_bodies(local_def_id);
805 // passes are timed inside typeck
806 typeck::check_crate(tcx)?;
808 sess.time("misc_checking_2", || {
811 sess.time("match_checking", || {
812 tcx.par_body_owners(|def_id| {
813 tcx.ensure().check_match(def_id);
818 sess.time("liveness_and_intrinsic_checking", || {
819 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
820 // this must run before MIR dump, because
821 // "not all control paths return a value" is reported here.
823 // maybe move the check to a MIR pass?
824 let local_def_id = tcx.hir().local_def_id(module);
826 tcx.ensure().check_mod_liveness(local_def_id);
827 tcx.ensure().check_mod_intrinsics(local_def_id);
834 sess.time("MIR_borrow_checking", || {
835 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
838 sess.time("dumping_chalk_like_clauses", || {
839 rustc_traits::lowering::dump_program_clauses(tcx);
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
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 _prof_timer = tcx.sess.prof.generic_activity("write_crate_metadata");
931 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
932 if need_metadata_file {
933 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
934 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
935 // To avoid races with another rustc process scanning the output directory,
936 // we need to write the file somewhere else and atomically move it to its
937 // final destination, with an `fs::rename` call. In order for the rename to
938 // always succeed, the temporary file needs to be on the same filesystem,
939 // which is why we create it inside the output directory specifically.
940 let metadata_tmpdir = TempFileBuilder::new()
942 .tempdir_in(out_filename.parent().unwrap())
943 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
944 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
945 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
946 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
948 if tcx.sess.opts.json_artifact_notifications {
952 .emit_artifact_notification(&out_filename, "metadata");
956 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
958 (metadata, need_metadata_module)
961 /// Runs the codegen backend, after which the AST and analysis can
963 pub fn start_codegen<'tcx>(
964 codegen_backend: &dyn CodegenBackend,
966 outputs: &OutputFilenames,
968 if log_enabled!(::log::Level::Info) {
969 println!("Pre-codegen");
970 tcx.print_debug_stats();
973 let (metadata, need_metadata_module) = encode_and_write_metadata(tcx, outputs);
975 let codegen = tcx.sess.time("codegen_crate", move || {
976 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
979 if log_enabled!(::log::Level::Info) {
980 println!("Post-codegen");
981 tcx.print_debug_stats();
984 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
985 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
986 tcx.sess.err(&format!("could not emit MIR: {}", e));
987 tcx.sess.abort_if_errors();