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;
9 use rustc::hir::def_id::{CrateNum, LOCAL_CRATE};
12 use rustc::middle::cstore::{CrateStore, MetadataLoader, MetadataLoaderDyn};
13 use rustc::session::config::{self, CrateType, Input, OutputFilenames, OutputType};
14 use rustc::session::config::{PpMode, PpSourceMode};
15 use rustc::session::search_paths::PathKind;
16 use rustc::session::Session;
18 use rustc::ty::steal::Steal;
19 use rustc::ty::{self, AllArenas, GlobalCtxt, ResolverOutputs, TyCtxt};
20 use rustc::util::common::{time, ErrorReported};
21 use rustc_builtin_macros;
22 use rustc_codegen_ssa::back::link::emit_metadata;
23 use rustc_codegen_utils::codegen_backend::CodegenBackend;
24 use rustc_codegen_utils::link::filename_for_metadata;
25 use rustc_data_structures::sync::{par_iter, Lrc, Once, ParallelIterator, WorkerLocal};
26 use rustc_data_structures::{box_region_allow_access, declare_box_region_type, parallel};
27 use rustc_errors::PResult;
28 use rustc_expand::base::ExtCtxt;
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 sess.diagnostic().set_continue_after_error(sess.opts.debugging_opts.continue_parse_after_error);
58 let krate = time(sess, "parsing", || {
59 let _prof_timer = sess.prof.generic_activity("parse_crate");
62 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
63 Input::Str { input, name } => {
64 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
69 sess.diagnostic().set_continue_after_error(true);
71 if sess.opts.debugging_opts.ast_json_noexpand {
72 println!("{}", json::as_json(&krate));
75 if sess.opts.debugging_opts.input_stats {
76 println!("Lines of code: {}", sess.source_map().count_lines());
77 println!("Pre-expansion node count: {}", count_nodes(&krate));
80 if let Some(ref s) = sess.opts.debugging_opts.show_span {
81 syntax::show_span::run(sess.diagnostic(), s, &krate);
84 if sess.opts.debugging_opts.hir_stats {
85 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
91 fn count_nodes(krate: &ast::Crate) -> usize {
92 let mut counter = NodeCounter::new();
93 visit::walk_crate(&mut counter, krate);
97 declare_box_region_type!(
100 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
103 /// Runs the "early phases" of the compiler: initial `cfg` processing, loading compiler plugins,
104 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
105 /// harness if one is to be provided, injection of a dependency on the
106 /// standard library and prelude, and name resolution.
108 /// Returns `None` if we're aborting after handling -W help.
109 pub fn configure_and_expand(
111 lint_store: Lrc<lint::LintStore>,
112 metadata_loader: Box<MetadataLoaderDyn>,
115 ) -> Result<(ast::Crate, BoxedResolver)> {
116 // Currently, we ignore the name resolution data structures for the purposes of dependency
117 // tracking. Instead we will run name resolution and include its output in the hash of each
118 // item, much like we do for macro expansion. In other words, the hash reflects not just
119 // its contents but the results of name resolution on those contents. Hopefully we'll push
120 // this back at some point.
121 let crate_name = crate_name.to_string();
122 let (result, resolver) = BoxedResolver::new(static move || {
124 let resolver_arenas = Resolver::arenas();
125 let res = configure_and_expand_inner(
133 let mut resolver = match res {
135 yield BoxedResolver::initial_yield(Err(v));
138 Ok((krate, resolver)) => {
139 yield BoxedResolver::initial_yield(Ok(krate));
143 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver));
144 resolver.into_outputs()
146 result.map(|k| (k, resolver))
150 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
151 match Rc::try_unwrap(resolver) {
152 Ok(resolver) => resolver.into_inner().complete(),
153 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
158 pub fn register_plugins<'a>(
160 metadata_loader: &'a dyn MetadataLoader,
161 register_lints: impl Fn(&Session, &mut lint::LintStore),
162 mut krate: ast::Crate,
164 ) -> Result<(ast::Crate, Lrc<lint::LintStore>)> {
165 krate = time(sess, "attributes injection", || {
166 rustc_builtin_macros::cmdline_attrs::inject(
169 &sess.opts.debugging_opts.crate_attr,
173 let (krate, features) = rustc_expand::config::features(
177 &sess.opts.debugging_opts.allow_features,
179 // these need to be set "early" so that expansion sees `quote` if enabled.
180 sess.init_features(features);
182 let crate_types = util::collect_crate_types(sess, &krate.attrs);
183 sess.crate_types.set(crate_types);
185 let disambiguator = util::compute_crate_disambiguator(sess);
186 sess.crate_disambiguator.set(disambiguator);
187 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
189 if sess.opts.incremental.is_some() {
190 time(sess, "garbage-collect incremental cache directory", || {
192 sess.prof.generic_activity("incr_comp_garbage_collect_session_directories");
193 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
195 "Error while trying to garbage collect incremental \
196 compilation cache directory: {}",
203 time(sess, "recursion limit", || {
204 middle::recursion_limit::update_limits(sess, &krate);
207 let mut lint_store = rustc_lint::new_lint_store(
208 sess.opts.debugging_opts.no_interleave_lints,
209 sess.unstable_options(),
211 register_lints(&sess, &mut lint_store);
214 time(sess, "plugin loading", || plugin::load::load_plugins(sess, metadata_loader, &krate));
215 time(sess, "plugin registration", || {
216 let mut registry = plugin::Registry { lint_store: &mut lint_store };
217 for registrar in registrars {
218 registrar(&mut registry);
222 Ok((krate, Lrc::new(lint_store)))
225 fn configure_and_expand_inner<'a>(
227 lint_store: &'a lint::LintStore,
228 mut krate: ast::Crate,
230 resolver_arenas: &'a ResolverArenas<'a>,
231 metadata_loader: &'a MetadataLoaderDyn,
232 ) -> Result<(ast::Crate, Resolver<'a>)> {
233 time(sess, "pre-AST-expansion lint checks", || {
234 lint::check_ast_crate(
240 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
244 let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
245 rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
247 krate = time(sess, "crate injection", || {
248 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
249 let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
255 if let Some(name) = name {
256 sess.parse_sess.injected_crate_name.set(name);
261 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
264 krate = time(sess, "expansion", || {
265 let _prof_timer = sess.prof.generic_activity("macro_expand_crate");
266 // Windows dlls do not have rpaths, so they don't know how to find their
267 // dependencies. It's up to us to tell the system where to find all the
268 // dependent dlls. Note that this uses cfg!(windows) as opposed to
269 // targ_cfg because syntax extensions are always loaded for the host
270 // compiler, not for the target.
272 // This is somewhat of an inherently racy operation, however, as
273 // multiple threads calling this function could possibly continue
274 // extending PATH far beyond what it should. To solve this for now we
275 // just don't add any new elements to PATH which are already there
276 // within PATH. This is basically a targeted fix at #17360 for rustdoc
277 // which runs rustc in parallel but has been seen (#33844) to cause
278 // problems with PATH becoming too long.
279 let mut old_path = OsString::new();
281 old_path = env::var_os("PATH").unwrap_or(old_path);
282 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
283 for path in env::split_paths(&old_path) {
284 if !new_path.contains(&path) {
291 new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
297 // Create the config for macro expansion
298 let features = sess.features_untracked();
299 let cfg = rustc_expand::expand::ExpansionConfig {
300 features: Some(&features),
301 recursion_limit: *sess.recursion_limit.get(),
302 trace_mac: sess.opts.debugging_opts.trace_macros,
303 should_test: sess.opts.test,
304 ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
307 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
309 // Expand macros now!
310 let krate = time(sess, "expand crate", || ecx.monotonic_expander().expand_crate(krate));
312 // The rest is error reporting
314 time(sess, "check unused macros", || {
315 ecx.check_unused_macros();
318 let mut missing_fragment_specifiers: Vec<_> =
319 ecx.parse_sess.missing_fragment_specifiers.borrow().iter().cloned().collect();
320 missing_fragment_specifiers.sort();
322 for span in missing_fragment_specifiers {
323 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
324 let msg = "missing fragment specifier";
325 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
328 env::set_var("PATH", &old_path);
333 time(sess, "maybe building test harness", || {
334 rustc_builtin_macros::test_harness::inject(
340 &sess.features_untracked(),
341 sess.panic_strategy(),
342 sess.target.target.options.panic_strategy,
343 sess.opts.debugging_opts.panic_abort_tests,
347 // If we're actually rustdoc then there's no need to actually compile
348 // anything, so switch everything to just looping
349 let mut should_loop = sess.opts.actually_rustdoc;
350 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
354 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
357 let has_proc_macro_decls = time(sess, "AST validation", || {
358 ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
361 let crate_types = sess.crate_types.borrow();
362 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
364 // For backwards compatibility, we don't try to run proc macro injection
365 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
366 // specified. This should only affect users who manually invoke 'rustdoc', as
367 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
368 // However, we do emit a warning, to let such users know that they should
369 // start passing '--crate-type proc-macro'
370 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
371 let mut msg = sess.diagnostic().struct_warn(
372 &"Trying to document proc macro crate \
373 without passing '--crate-type proc-macro to rustdoc",
376 msg.warn("The generated documentation may be incorrect");
379 krate = time(sess, "maybe creating a macro crate", || {
380 let num_crate_types = crate_types.len();
381 let is_test_crate = sess.opts.test;
382 rustc_builtin_macros::proc_macro_harness::inject(
387 has_proc_macro_decls,
395 // Done with macro expansion!
397 if sess.opts.debugging_opts.input_stats {
398 println!("Post-expansion node count: {}", count_nodes(&krate));
401 if sess.opts.debugging_opts.hir_stats {
402 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
405 if sess.opts.debugging_opts.ast_json {
406 println!("{}", json::as_json(&krate));
409 time(sess, "name resolution", || {
410 resolver.resolve_crate(&krate);
413 // Needs to go *after* expansion to be able to check the results of macro expansion.
414 time(sess, "complete gated feature checking", || {
415 syntax::feature_gate::check_crate(
418 &sess.features_untracked(),
419 sess.opts.unstable_features,
423 // Add all buffered lints from the `ParseSess` to the `Session`.
424 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
425 info!("{} parse sess buffered_lints", buffered_lints.len());
426 for BufferedEarlyLint { id, span, msg, lint_id } in buffered_lints.drain(..) {
427 resolver.lint_buffer().buffer_lint(lint_id, id, span, &msg);
431 Ok((krate, resolver))
434 pub fn lower_to_hir<'res, 'tcx>(
436 lint_store: &lint::LintStore,
437 resolver: &'res mut Resolver<'_>,
438 dep_graph: &'res DepGraph,
439 krate: &'res ast::Crate,
440 arena: &'tcx Arena<'tcx>,
441 ) -> Result<hir::map::Forest<'tcx>> {
443 let hir_forest = time(sess, "lowering AST -> HIR", || {
444 let hir_crate = rustc_ast_lowering::lower_crate(
449 rustc_parse::nt_to_tokenstream,
453 if sess.opts.debugging_opts.hir_stats {
454 hir_stats::print_hir_stats(&hir_crate);
457 hir::map::Forest::new(hir_crate, &dep_graph)
460 time(sess, "early lint checks", || {
461 lint::check_ast_crate(
466 Some(std::mem::take(resolver.lint_buffer())),
467 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
471 // Discard hygiene data, which isn't required after lowering to HIR.
472 if !sess.opts.debugging_opts.keep_hygiene_data {
473 rustc_span::hygiene::clear_syntax_context_map();
479 // Returns all the paths that correspond to generated files.
480 fn generated_output_paths(
482 outputs: &OutputFilenames,
486 let mut out_filenames = Vec::new();
487 for output_type in sess.opts.output_types.keys() {
488 let file = outputs.path(*output_type);
490 // If the filename has been overridden using `-o`, it will not be modified
491 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
492 OutputType::Exe if !exact_name => {
493 for crate_type in sess.crate_types.borrow().iter() {
494 let p = ::rustc_codegen_utils::link::filename_for_input(
500 out_filenames.push(p);
503 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
504 // Don't add the dep-info output when omitting it from dep-info targets
507 out_filenames.push(file);
514 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
515 // returns None for every file path.
516 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
518 F: Fn(&PathBuf) -> Option<T>,
520 for output_path in output_paths {
521 if let Some(result) = f(output_path) {
528 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
529 let input_path = input_path.canonicalize().ok();
530 if input_path.is_none() {
533 let check = |output_path: &PathBuf| {
534 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
536 check_output(output_paths, check).is_some()
539 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
540 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
541 check_output(output_paths, check)
544 fn escape_dep_filename(filename: &FileName) -> String {
545 // Apparently clang and gcc *only* escape spaces:
546 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
547 filename.to_string().replace(" ", "\\ ")
552 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
553 outputs: &OutputFilenames,
554 out_filenames: &[PathBuf],
556 // Write out dependency rules to the dep-info file if requested
557 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
560 let deps_filename = outputs.path(OutputType::DepInfo);
562 let result = (|| -> io::Result<()> {
563 // Build a list of files used to compile the output and
564 // write Makefile-compatible dependency rules
565 let mut files: Vec<String> = sess
569 .filter(|fmap| fmap.is_real_file())
570 .filter(|fmap| !fmap.is_imported())
571 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
574 if sess.binary_dep_depinfo() {
575 boxed_resolver.borrow().borrow_mut().access(|resolver| {
576 for cnum in resolver.cstore().crates_untracked() {
577 let source = resolver.cstore().crate_source_untracked(cnum);
578 if let Some((path, _)) = source.dylib {
579 files.push(escape_dep_filename(&FileName::Real(path)));
581 if let Some((path, _)) = source.rlib {
582 files.push(escape_dep_filename(&FileName::Real(path)));
584 if let Some((path, _)) = source.rmeta {
585 files.push(escape_dep_filename(&FileName::Real(path)));
591 let mut file = fs::File::create(&deps_filename)?;
592 for path in out_filenames {
593 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
596 // Emit a fake target for each input file to the compilation. This
597 // prevents `make` from spitting out an error if a file is later
598 // deleted. For more info see #28735
600 writeln!(file, "{}:", path)?;
607 if sess.opts.json_artifact_notifications {
610 .emit_artifact_notification(&deps_filename, "dep-info");
613 Err(e) => sess.fatal(&format!(
614 "error writing dependencies to `{}`: {}",
615 deps_filename.display(),
621 pub fn prepare_outputs(
625 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
627 ) -> Result<OutputFilenames> {
628 // FIXME: rustdoc passes &[] instead of &krate.attrs here
629 let outputs = util::build_output_filenames(
631 &compiler.output_dir,
632 &compiler.output_file,
638 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
640 // Ensure the source file isn't accidentally overwritten during compilation.
641 if let Some(ref input_path) = compiler.input_path {
642 if sess.opts.will_create_output_file() {
643 if output_contains_path(&output_paths, input_path) {
645 "the input file \"{}\" would be overwritten by the generated \
649 return Err(ErrorReported);
651 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
653 "the generated executable for the input file \"{}\" conflicts with the \
654 existing directory \"{}\"",
655 input_path.display(),
658 return Err(ErrorReported);
663 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
665 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
666 && sess.opts.output_types.len() == 1;
669 if let Some(ref dir) = compiler.output_dir {
670 if fs::create_dir_all(dir).is_err() {
671 sess.err("failed to find or create the directory specified by `--out-dir`");
672 return Err(ErrorReported);
680 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
681 providers.analysis = analysis;
682 proc_macro_decls::provide(providers);
683 plugin::build::provide(providers);
684 hir::provide(providers);
685 mir::provide(providers);
686 rustc_privacy::provide(providers);
687 typeck::provide(providers);
688 ty::provide(providers);
689 traits::provide(providers);
690 rustc_passes::provide(providers);
691 rustc_resolve::provide(providers);
692 rustc_traits::provide(providers);
693 rustc_metadata::provide(providers);
694 lint::provide(providers);
695 rustc_lint::provide(providers);
696 rustc_codegen_utils::provide(providers);
697 rustc_codegen_ssa::provide(providers);
700 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
701 rustc_metadata::provide_extern(providers);
702 rustc_codegen_ssa::provide_extern(providers);
705 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
707 impl<'tcx> QueryContext<'tcx> {
708 pub fn enter<F, R>(&mut self, f: F) -> R
710 F: FnOnce(TyCtxt<'tcx>) -> R,
712 ty::tls::enter_global(self.0, |tcx| f(tcx))
715 pub fn print_stats(&self) {
716 self.0.queries.print_stats()
720 pub fn create_global_ctxt<'tcx>(
721 compiler: &'tcx Compiler,
722 lint_store: Lrc<lint::LintStore>,
723 hir_forest: &'tcx hir::map::Forest<'tcx>,
724 mut resolver_outputs: ResolverOutputs,
725 outputs: OutputFilenames,
727 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
728 all_arenas: &'tcx AllArenas,
729 arena: &'tcx WorkerLocal<Arena<'tcx>>,
730 ) -> QueryContext<'tcx> {
731 let sess = &compiler.session();
732 let defs = mem::take(&mut resolver_outputs.definitions);
734 // Construct the HIR map.
735 let hir_map = time(sess, "indexing HIR", || {
736 hir::map::map_crate(sess, &*resolver_outputs.cstore, &hir_forest, defs)
739 let query_result_on_disk_cache =
740 time(sess, "load query result cache", || rustc_incremental::load_query_result_cache(sess));
742 let codegen_backend = compiler.codegen_backend();
743 let mut local_providers = ty::query::Providers::default();
744 default_provide(&mut local_providers);
745 codegen_backend.provide(&mut local_providers);
747 let mut extern_providers = local_providers;
748 default_provide_extern(&mut extern_providers);
749 codegen_backend.provide_extern(&mut extern_providers);
751 if let Some(callback) = compiler.override_queries {
752 callback(sess, &mut local_providers, &mut extern_providers);
755 let gcx = global_ctxt.init_locking(|| {
756 TyCtxt::create_global_ctxt(
765 query_result_on_disk_cache,
771 // Do some initialization of the DepGraph that can only be done with the tcx available.
772 ty::tls::enter_global(&gcx, |tcx| {
773 time(tcx.sess, "dep graph tcx init", || rustc_incremental::dep_graph_tcx_init(tcx));
779 /// Runs the resolution, type-checking, region checking and other
780 /// miscellaneous analysis passes on the crate.
781 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
782 assert_eq!(cnum, LOCAL_CRATE);
785 let mut entry_point = None;
787 time(sess, "misc checking 1", || {
790 entry_point = time(sess, "looking for entry point", || {
791 rustc_passes::entry::find_entry_point(tcx)
794 time(sess, "looking for plugin registrar", || {
795 plugin::build::find_plugin_registrar(tcx)
798 time(sess, "looking for derive registrar", || proc_macro_decls::find(tcx));
801 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
802 let local_def_id = tcx.hir().local_def_id(module);
803 tcx.ensure().check_mod_loops(local_def_id);
804 tcx.ensure().check_mod_attrs(local_def_id);
805 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
806 tcx.ensure().check_mod_const_bodies(local_def_id);
812 // passes are timed inside typeck
813 typeck::check_crate(tcx)?;
815 time(sess, "misc checking 2", || {
818 time(sess, "match checking", || {
819 tcx.par_body_owners(|def_id| {
820 tcx.ensure().check_match(def_id);
825 time(sess, "liveness checking + intrinsic checking", || {
826 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
827 // this must run before MIR dump, because
828 // "not all control paths return a value" is reported here.
830 // maybe move the check to a MIR pass?
831 let local_def_id = tcx.hir().local_def_id(module);
833 tcx.ensure().check_mod_liveness(local_def_id);
834 tcx.ensure().check_mod_intrinsics(local_def_id);
841 time(sess, "MIR borrow checking", || {
842 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
845 time(sess, "dumping Chalk-like clauses", || {
846 rustc_traits::lowering::dump_program_clauses(tcx);
849 time(sess, "MIR effect checking", || {
850 for def_id in tcx.body_owners() {
851 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
855 time(sess, "layout testing", || layout_test::test_layout(tcx));
857 // Avoid overwhelming user with errors if borrow checking failed.
858 // I'm not sure how helpful this is, to be honest, but it avoids a
859 // lot of annoying errors in the compile-fail tests (basically,
860 // lint warnings and so on -- kindck used to do this abort, but
861 // kindck is gone now). -nmatsakis
862 if sess.has_errors() {
863 return Err(ErrorReported);
866 time(sess, "misc checking 3", || {
869 time(sess, "privacy access levels", || {
870 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
874 time(sess, "private in public", || {
875 tcx.ensure().check_private_in_public(LOCAL_CRATE);
879 time(sess, "death checking", || rustc_passes::dead::check_crate(tcx));
882 time(sess, "unused lib feature checking", || {
883 rustc_passes::stability::check_unused_or_stable_features(tcx)
887 time(sess, "lint checking", || {
888 lint::check_crate(tcx, || {
889 rustc_lint::BuiltinCombinedLateLintPass::new()
896 time(sess, "privacy checking modules", || {
897 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
898 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
908 fn encode_and_write_metadata(
910 outputs: &OutputFilenames,
911 ) -> (middle::cstore::EncodedMetadata, bool) {
912 #[derive(PartialEq, Eq, PartialOrd, Ord)]
919 let metadata_kind = tcx
924 .map(|ty| match *ty {
925 CrateType::Executable | CrateType::Staticlib | CrateType::Cdylib => MetadataKind::None,
927 CrateType::Rlib => MetadataKind::Uncompressed,
929 CrateType::Dylib | CrateType::ProcMacro => MetadataKind::Compressed,
932 .unwrap_or(MetadataKind::None);
934 let metadata = match metadata_kind {
935 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
936 MetadataKind::Uncompressed | MetadataKind::Compressed => tcx.encode_metadata(),
939 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
940 if need_metadata_file {
941 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
942 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
943 // To avoid races with another rustc process scanning the output directory,
944 // we need to write the file somewhere else and atomically move it to its
945 // final destination, with an `fs::rename` call. In order for the rename to
946 // always succeed, the temporary file needs to be on the same filesystem,
947 // which is why we create it inside the output directory specifically.
948 let metadata_tmpdir = TempFileBuilder::new()
950 .tempdir_in(out_filename.parent().unwrap())
951 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
952 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
953 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
954 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
956 if tcx.sess.opts.json_artifact_notifications {
960 .emit_artifact_notification(&out_filename, "metadata");
964 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
966 (metadata, need_metadata_module)
969 /// Runs the codegen backend, after which the AST and analysis can
971 pub fn start_codegen<'tcx>(
972 codegen_backend: &dyn CodegenBackend,
974 outputs: &OutputFilenames,
976 if log_enabled!(::log::Level::Info) {
977 println!("Pre-codegen");
978 tcx.print_debug_stats();
981 let (metadata, need_metadata_module) =
982 time(tcx.sess, "metadata encoding and writing", || encode_and_write_metadata(tcx, outputs));
984 let codegen = time(tcx.sess, "codegen", move || {
985 let _prof_timer = tcx.prof.generic_activity("codegen_crate");
986 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
989 if log_enabled!(::log::Level::Info) {
990 println!("Post-codegen");
991 tcx.print_debug_stats();
994 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
995 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
996 tcx.sess.err(&format!("could not emit MIR: {}", e));
997 tcx.sess.abort_if_errors();