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, Once, 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::{
31 self, CrateType, Input, OutputFilenames, OutputType, PpMode, PpSourceMode,
33 use rustc_session::lint;
34 use rustc_session::output::{filename_for_input, filename_for_metadata};
35 use rustc_session::search_paths::PathKind;
36 use rustc_session::Session;
37 use rustc_span::symbol::Symbol;
38 use rustc_span::FileName;
39 use rustc_trait_selection::traits;
40 use rustc_typeck as typeck;
42 use rustc_serialize::json;
43 use tempfile::Builder as TempFileBuilder;
46 use std::cell::RefCell;
47 use std::ffi::OsString;
48 use std::io::{self, BufWriter, Write};
49 use std::path::PathBuf;
51 use std::{env, fs, iter, mem};
53 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
54 let krate = sess.time("parse_crate", || match input {
55 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
56 Input::Str { input, name } => {
57 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
61 if sess.opts.debugging_opts.ast_json_noexpand {
62 println!("{}", json::as_json(&krate));
65 if sess.opts.debugging_opts.input_stats {
66 println!("Lines of code: {}", sess.source_map().count_lines());
67 println!("Pre-expansion node count: {}", count_nodes(&krate));
70 if let Some(ref s) = sess.opts.debugging_opts.show_span {
71 rustc_ast_passes::show_span::run(sess.diagnostic(), s, &krate);
74 if sess.opts.debugging_opts.hir_stats {
75 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
81 fn count_nodes(krate: &ast::Crate) -> usize {
82 let mut counter = rustc_ast_passes::node_count::NodeCounter::new();
83 visit::walk_crate(&mut counter, krate);
87 declare_box_region_type!(
90 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
93 /// Runs the "early phases" of the compiler: initial `cfg` processing, loading compiler plugins,
94 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
95 /// harness if one is to be provided, injection of a dependency on the
96 /// standard library and prelude, and name resolution.
98 /// Returns `None` if we're aborting after handling -W help.
99 pub fn configure_and_expand(
101 lint_store: Lrc<LintStore>,
102 metadata_loader: Box<MetadataLoaderDyn>,
105 ) -> Result<(ast::Crate, BoxedResolver)> {
106 // Currently, we ignore the name resolution data structures for the purposes of dependency
107 // tracking. Instead we will run name resolution and include its output in the hash of each
108 // item, much like we do for macro expansion. In other words, the hash reflects not just
109 // its contents but the results of name resolution on those contents. Hopefully we'll push
110 // this back at some point.
111 let crate_name = crate_name.to_string();
112 let (result, resolver) = BoxedResolver::new(static move || {
114 let resolver_arenas = Resolver::arenas();
115 let res = configure_and_expand_inner(
123 let mut resolver = match res {
125 yield BoxedResolver::initial_yield(Err(v));
128 Ok((krate, resolver)) => {
129 yield BoxedResolver::initial_yield(Ok(krate));
133 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver));
134 resolver.into_outputs()
136 result.map(|k| (k, resolver))
140 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
141 match Rc::try_unwrap(resolver) {
142 Ok(resolver) => resolver.into_inner().complete(),
143 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
148 pub fn register_plugins<'a>(
150 metadata_loader: &'a dyn MetadataLoader,
151 register_lints: impl Fn(&Session, &mut LintStore),
152 mut krate: ast::Crate,
154 ) -> Result<(ast::Crate, Lrc<LintStore>)> {
155 krate = sess.time("attributes_injection", || {
156 rustc_builtin_macros::cmdline_attrs::inject(
159 &sess.opts.debugging_opts.crate_attr,
163 let (krate, features) = rustc_expand::config::features(
167 &sess.opts.debugging_opts.allow_features,
169 // these need to be set "early" so that expansion sees `quote` if enabled.
170 sess.init_features(features);
172 let crate_types = util::collect_crate_types(sess, &krate.attrs);
173 sess.crate_types.set(crate_types);
175 let disambiguator = util::compute_crate_disambiguator(sess);
176 sess.crate_disambiguator.set(disambiguator);
177 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
179 if sess.opts.incremental.is_some() {
180 sess.time("incr_comp_garbage_collect_session_directories", || {
181 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
183 "Error while trying to garbage collect incremental \
184 compilation cache directory: {}",
191 sess.time("recursion_limit", || {
192 middle::limits::update_limits(sess, &krate);
195 let mut lint_store = rustc_lint::new_lint_store(
196 sess.opts.debugging_opts.no_interleave_lints,
197 sess.unstable_options(),
199 register_lints(&sess, &mut lint_store);
202 sess.time("plugin_loading", || plugin::load::load_plugins(sess, metadata_loader, &krate));
203 sess.time("plugin_registration", || {
204 let mut registry = plugin::Registry { lint_store: &mut lint_store };
205 for registrar in registrars {
206 registrar(&mut registry);
210 Ok((krate, Lrc::new(lint_store)))
213 fn pre_expansion_lint(sess: &Session, lint_store: &LintStore, krate: &ast::Crate) {
214 sess.time("pre_AST_expansion_lint_checks", || {
215 rustc_lint::check_ast_crate(
221 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
226 fn configure_and_expand_inner<'a>(
228 lint_store: &'a LintStore,
229 mut krate: ast::Crate,
231 resolver_arenas: &'a ResolverArenas<'a>,
232 metadata_loader: &'a MetadataLoaderDyn,
233 ) -> Result<(ast::Crate, Resolver<'a>)> {
234 pre_expansion_lint(sess, lint_store, &krate);
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 extern_mod_loaded = |k: &ast::Crate| pre_expansion_lint(sess, lint_store, k);
299 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver, Some(&extern_mod_loaded));
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 let recursion_limit_hit = ecx.reduced_recursion_limit.is_some();
316 for span in missing_fragment_specifiers {
317 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
318 let msg = "missing fragment specifier";
319 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
322 env::set_var("PATH", &old_path);
325 if recursion_limit_hit {
326 // If we hit a recursion limit, exit early to avoid later passes getting overwhelmed
334 sess.time("maybe_building_test_harness", || {
335 rustc_builtin_macros::test_harness::inject(
341 &sess.features_untracked(),
342 sess.panic_strategy(),
343 sess.target.target.options.panic_strategy,
344 sess.opts.debugging_opts.panic_abort_tests,
348 // If we're actually rustdoc then there's no need to actually compile
349 // anything, so switch everything to just looping
350 let mut should_loop = sess.opts.actually_rustdoc;
351 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
355 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
358 let has_proc_macro_decls = sess.time("AST_validation", || {
359 rustc_ast_passes::ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
362 let crate_types = sess.crate_types.borrow();
363 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
365 // For backwards compatibility, we don't try to run proc macro injection
366 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
367 // specified. This should only affect users who manually invoke 'rustdoc', as
368 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
369 // However, we do emit a warning, to let such users know that they should
370 // start passing '--crate-type proc-macro'
371 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
372 let mut msg = sess.diagnostic().struct_warn(
373 &"Trying to document proc macro crate \
374 without passing '--crate-type proc-macro to rustdoc",
377 msg.warn("The generated documentation may be incorrect");
380 krate = sess.time("maybe_create_a_macro_crate", || {
381 let num_crate_types = crate_types.len();
382 let is_test_crate = sess.opts.test;
383 rustc_builtin_macros::proc_macro_harness::inject(
388 has_proc_macro_decls,
396 // Done with macro expansion!
398 if sess.opts.debugging_opts.input_stats {
399 println!("Post-expansion node count: {}", count_nodes(&krate));
402 if sess.opts.debugging_opts.hir_stats {
403 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
406 if sess.opts.debugging_opts.ast_json {
407 println!("{}", json::as_json(&krate));
410 resolver.resolve_crate(&krate);
412 // Needs to go *after* expansion to be able to check the results of macro expansion.
413 sess.time("complete_gated_feature_checking", || {
414 rustc_ast_passes::feature_gate::check_crate(
417 &sess.features_untracked(),
418 sess.opts.unstable_features,
422 // Add all buffered lints from the `ParseSess` to the `Session`.
423 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
424 info!("{} parse sess buffered_lints", buffered_lints.len());
425 for early_lint in buffered_lints.drain(..) {
426 resolver.lint_buffer().add_early_lint(early_lint);
430 Ok((krate, resolver))
433 pub fn lower_to_hir<'res, 'tcx>(
435 lint_store: &LintStore,
436 resolver: &'res mut Resolver<'_>,
437 dep_graph: &'res DepGraph,
438 krate: &'res ast::Crate,
439 arena: &'tcx rustc_ast_lowering::Arena<'tcx>,
441 // We're constructing the HIR here; we don't care what we will
442 // read, since we haven't even constructed the *input* to
444 dep_graph.assert_ignored();
447 let hir_crate = rustc_ast_lowering::lower_crate(
451 rustc_parse::nt_to_tokenstream,
455 if sess.opts.debugging_opts.hir_stats {
456 hir_stats::print_hir_stats(&hir_crate);
459 sess.time("early_lint_checks", || {
460 rustc_lint::check_ast_crate(
465 Some(std::mem::take(resolver.lint_buffer())),
466 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
470 // Discard hygiene data, which isn't required after lowering to HIR.
471 if !sess.opts.debugging_opts.keep_hygiene_data {
472 rustc_span::hygiene::clear_syntax_context_map();
478 // Returns all the paths that correspond to generated files.
479 fn generated_output_paths(
481 outputs: &OutputFilenames,
485 let mut out_filenames = Vec::new();
486 for output_type in sess.opts.output_types.keys() {
487 let file = outputs.path(*output_type);
489 // If the filename has been overridden using `-o`, it will not be modified
490 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
491 OutputType::Exe if !exact_name => {
492 for crate_type in sess.crate_types.borrow().iter() {
493 let p = filename_for_input(sess, *crate_type, crate_name, outputs);
494 out_filenames.push(p);
497 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
498 // Don't add the dep-info output when omitting it from dep-info targets
501 out_filenames.push(file);
508 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
509 // returns None for every file path.
510 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
512 F: Fn(&PathBuf) -> Option<T>,
514 for output_path in output_paths {
515 if let Some(result) = f(output_path) {
522 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
523 let input_path = input_path.canonicalize().ok();
524 if input_path.is_none() {
527 let check = |output_path: &PathBuf| {
528 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
530 check_output(output_paths, check).is_some()
533 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
534 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
535 check_output(output_paths, check)
538 fn escape_dep_filename(filename: &FileName) -> String {
539 // Apparently clang and gcc *only* escape spaces:
540 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
541 filename.to_string().replace(" ", "\\ ")
546 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
547 outputs: &OutputFilenames,
548 out_filenames: &[PathBuf],
550 // Write out dependency rules to the dep-info file if requested
551 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
554 let deps_filename = outputs.path(OutputType::DepInfo);
556 let result = (|| -> io::Result<()> {
557 // Build a list of files used to compile the output and
558 // write Makefile-compatible dependency rules
559 let mut files: Vec<String> = sess
563 .filter(|fmap| fmap.is_real_file())
564 .filter(|fmap| !fmap.is_imported())
565 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
568 if sess.binary_dep_depinfo() {
569 boxed_resolver.borrow().borrow_mut().access(|resolver| {
570 for cnum in resolver.cstore().crates_untracked() {
571 let source = resolver.cstore().crate_source_untracked(cnum);
572 if let Some((path, _)) = source.dylib {
573 files.push(escape_dep_filename(&FileName::Real(path)));
575 if let Some((path, _)) = source.rlib {
576 files.push(escape_dep_filename(&FileName::Real(path)));
578 if let Some((path, _)) = source.rmeta {
579 files.push(escape_dep_filename(&FileName::Real(path)));
585 let mut file = BufWriter::new(fs::File::create(&deps_filename)?);
586 for path in out_filenames {
587 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
590 // Emit a fake target for each input file to the compilation. This
591 // prevents `make` from spitting out an error if a file is later
592 // deleted. For more info see #28735
594 writeln!(file, "{}:", path)?;
601 if sess.opts.json_artifact_notifications {
604 .emit_artifact_notification(&deps_filename, "dep-info");
607 Err(e) => sess.fatal(&format!(
608 "error writing dependencies to `{}`: {}",
609 deps_filename.display(),
615 pub fn prepare_outputs(
619 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
621 ) -> Result<OutputFilenames> {
622 let _timer = sess.timer("prepare_outputs");
624 // FIXME: rustdoc passes &[] instead of &krate.attrs here
625 let outputs = util::build_output_filenames(
627 &compiler.output_dir,
628 &compiler.output_file,
634 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
636 // Ensure the source file isn't accidentally overwritten during compilation.
637 if let Some(ref input_path) = compiler.input_path {
638 if sess.opts.will_create_output_file() {
639 if output_contains_path(&output_paths, input_path) {
641 "the input file \"{}\" would be overwritten by the generated \
645 return Err(ErrorReported);
647 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
649 "the generated executable for the input file \"{}\" conflicts with the \
650 existing directory \"{}\"",
651 input_path.display(),
654 return Err(ErrorReported);
659 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
661 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
662 && sess.opts.output_types.len() == 1;
665 if let Some(ref dir) = compiler.output_dir {
666 if fs::create_dir_all(dir).is_err() {
667 sess.err("failed to find or create the directory specified by `--out-dir`");
668 return Err(ErrorReported);
676 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
677 providers.analysis = analysis;
678 proc_macro_decls::provide(providers);
679 plugin::build::provide(providers);
680 rustc_middle::hir::provide(providers);
681 mir::provide(providers);
682 mir_build::provide(providers);
683 rustc_privacy::provide(providers);
684 typeck::provide(providers);
685 ty::provide(providers);
686 traits::provide(providers);
687 rustc_passes::provide(providers);
688 rustc_resolve::provide(providers);
689 rustc_traits::provide(providers);
690 rustc_ty::provide(providers);
691 rustc_metadata::provide(providers);
692 rustc_lint::provide(providers);
693 rustc_symbol_mangling::provide(providers);
694 rustc_codegen_ssa::provide(providers);
697 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
698 rustc_metadata::provide_extern(providers);
699 rustc_codegen_ssa::provide_extern(providers);
702 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
704 impl<'tcx> QueryContext<'tcx> {
705 pub fn enter<F, R>(&mut self, f: F) -> R
707 F: FnOnce(TyCtxt<'tcx>) -> R,
709 ty::tls::enter_global(self.0, f)
712 pub fn print_stats(&mut self) {
713 self.enter(ty::query::print_stats)
717 pub fn create_global_ctxt<'tcx>(
718 compiler: &'tcx Compiler,
719 lint_store: Lrc<LintStore>,
720 krate: &'tcx Crate<'tcx>,
722 mut resolver_outputs: ResolverOutputs,
723 outputs: OutputFilenames,
725 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
726 arena: &'tcx WorkerLocal<Arena<'tcx>>,
727 ) -> QueryContext<'tcx> {
728 let sess = &compiler.session();
729 let defs: &'tcx Definitions = arena.alloc(mem::take(&mut resolver_outputs.definitions));
731 let query_result_on_disk_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 = sess.time("setup_global_ctxt", || {
747 global_ctxt.init_locking(|| {
748 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);
778 rustc_passes::hir_id_validator::check_crate(tcx);
781 let mut entry_point = None;
783 sess.time("misc_checking_1", || {
787 .time("looking_for_entry_point", || rustc_passes::entry::find_entry_point(tcx));
789 sess.time("looking_for_plugin_registrar", || {
790 plugin::build::find_plugin_registrar(tcx)
793 sess.time("looking_for_derive_registrar", || proc_macro_decls::find(tcx));
796 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
797 let local_def_id = tcx.hir().local_def_id(module);
798 tcx.ensure().check_mod_loops(local_def_id);
799 tcx.ensure().check_mod_attrs(local_def_id);
800 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
801 tcx.ensure().check_mod_const_bodies(local_def_id);
807 // passes are timed inside typeck
808 typeck::check_crate(tcx)?;
810 sess.time("misc_checking_2", || {
813 sess.time("match_checking", || {
814 tcx.par_body_owners(|def_id| {
815 tcx.ensure().check_match(def_id.to_def_id());
820 sess.time("liveness_and_intrinsic_checking", || {
821 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
822 // this must run before MIR dump, because
823 // "not all control paths return a value" is reported here.
825 // maybe move the check to a MIR pass?
826 let local_def_id = tcx.hir().local_def_id(module);
828 tcx.ensure().check_mod_liveness(local_def_id);
829 tcx.ensure().check_mod_intrinsics(local_def_id);
836 sess.time("MIR_borrow_checking", || {
837 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id.to_def_id()));
840 sess.time("dumping_chalk_like_clauses", || {
841 rustc_traits::lowering::dump_program_clauses(tcx);
844 sess.time("MIR_effect_checking", || {
845 for def_id in tcx.body_owners() {
846 mir::transform::check_unsafety::check_unsafety(tcx, def_id.to_def_id())
850 sess.time("layout_testing", || layout_test::test_layout(tcx));
852 // Avoid overwhelming user with errors if borrow checking failed.
853 // I'm not sure how helpful this is, to be honest, but it avoids a
854 // lot of annoying errors in the compile-fail tests (basically,
855 // lint warnings and so on -- kindck used to do this abort, but
856 // kindck is gone now). -nmatsakis
857 if sess.has_errors() {
858 return Err(ErrorReported);
861 sess.time("misc_checking_3", || {
864 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
868 tcx.ensure().check_private_in_public(LOCAL_CRATE);
871 sess.time("death_checking", || rustc_passes::dead::check_crate(tcx));
874 sess.time("unused_lib_feature_checking", || {
875 rustc_passes::stability::check_unused_or_stable_features(tcx)
879 sess.time("lint_checking", || {
880 rustc_lint::check_crate(tcx, || {
881 rustc_lint::BuiltinCombinedLateLintPass::new()
888 sess.time("privacy_checking_modules", || {
889 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
890 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
900 fn encode_and_write_metadata(
902 outputs: &OutputFilenames,
903 ) -> (middle::cstore::EncodedMetadata, bool) {
904 #[derive(PartialEq, Eq, PartialOrd, Ord)]
911 let metadata_kind = tcx
916 .map(|ty| match *ty {
917 CrateType::Executable | CrateType::Staticlib | CrateType::Cdylib => MetadataKind::None,
919 CrateType::Rlib => MetadataKind::Uncompressed,
921 CrateType::Dylib | CrateType::ProcMacro => MetadataKind::Compressed,
924 .unwrap_or(MetadataKind::None);
926 let metadata = match metadata_kind {
927 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
928 MetadataKind::Uncompressed | MetadataKind::Compressed => tcx.encode_metadata(),
931 let _prof_timer = tcx.sess.prof.generic_activity("write_crate_metadata");
933 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
934 if need_metadata_file {
935 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
936 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
937 // To avoid races with another rustc process scanning the output directory,
938 // we need to write the file somewhere else and atomically move it to its
939 // final destination, with an `fs::rename` call. In order for the rename to
940 // always succeed, the temporary file needs to be on the same filesystem,
941 // which is why we create it inside the output directory specifically.
942 let metadata_tmpdir = TempFileBuilder::new()
944 .tempdir_in(out_filename.parent().unwrap())
945 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
946 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
947 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
948 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
950 if tcx.sess.opts.json_artifact_notifications {
954 .emit_artifact_notification(&out_filename, "metadata");
958 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
960 (metadata, need_metadata_module)
963 /// Runs the codegen backend, after which the AST and analysis can
965 pub fn start_codegen<'tcx>(
966 codegen_backend: &dyn CodegenBackend,
968 outputs: &OutputFilenames,
970 if log_enabled!(::log::Level::Info) {
971 println!("Pre-codegen");
972 tcx.print_debug_stats();
975 let (metadata, need_metadata_module) = encode_and_write_metadata(tcx, outputs);
977 let codegen = tcx.sess.time("codegen_crate", move || {
978 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
981 if log_enabled!(::log::Level::Info) {
982 println!("Post-codegen");
983 tcx.print_debug_stats();
986 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
987 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
988 tcx.sess.err(&format!("could not emit MIR: {}", e));
989 tcx.sess.abort_if_errors();