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;
16 use rustc::ty::steal::Steal;
17 use rustc::ty::{self, GlobalCtxt, ResolverOutputs, TyCtxt};
18 use rustc::util::common::ErrorReported;
19 use rustc_ast::mut_visit::MutVisitor;
20 use rustc_ast::{self, ast, visit};
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};
30 use rustc_infer::traits;
31 use rustc_lint::LintStore;
33 use rustc_mir_build as mir_build;
34 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
35 use rustc_passes::{self, hir_stats, layout_test};
36 use rustc_plugin_impl as plugin;
37 use rustc_resolve::{Resolver, ResolverArenas};
38 use rustc_span::symbol::Symbol;
39 use rustc_span::FileName;
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::recursion_limit::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 configure_and_expand_inner<'a>(
215 lint_store: &'a LintStore,
216 mut krate: ast::Crate,
218 resolver_arenas: &'a ResolverArenas<'a>,
219 metadata_loader: &'a MetadataLoaderDyn,
220 ) -> Result<(ast::Crate, Resolver<'a>)> {
221 sess.time("pre_AST_expansion_lint_checks", || {
222 rustc_lint::check_ast_crate(
228 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
232 let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
233 rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
235 krate = sess.time("crate_injection", || {
236 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
237 let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
243 if let Some(name) = name {
244 sess.parse_sess.injected_crate_name.set(name);
249 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
252 krate = sess.time("macro_expand_crate", || {
253 // Windows dlls do not have rpaths, so they don't know how to find their
254 // dependencies. It's up to us to tell the system where to find all the
255 // dependent dlls. Note that this uses cfg!(windows) as opposed to
256 // targ_cfg because syntax extensions are always loaded for the host
257 // compiler, not for the target.
259 // This is somewhat of an inherently racy operation, however, as
260 // multiple threads calling this function could possibly continue
261 // extending PATH far beyond what it should. To solve this for now we
262 // just don't add any new elements to PATH which are already there
263 // within PATH. This is basically a targeted fix at #17360 for rustdoc
264 // which runs rustc in parallel but has been seen (#33844) to cause
265 // problems with PATH becoming too long.
266 let mut old_path = OsString::new();
268 old_path = env::var_os("PATH").unwrap_or(old_path);
269 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
270 for path in env::split_paths(&old_path) {
271 if !new_path.contains(&path) {
278 new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
284 // Create the config for macro expansion
285 let features = sess.features_untracked();
286 let cfg = rustc_expand::expand::ExpansionConfig {
287 features: Some(&features),
288 recursion_limit: *sess.recursion_limit.get(),
289 trace_mac: sess.opts.debugging_opts.trace_macros,
290 should_test: sess.opts.test,
291 ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
294 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
296 // Expand macros now!
297 let krate = sess.time("expand_crate", || ecx.monotonic_expander().expand_crate(krate));
299 // The rest is error reporting
301 sess.time("check_unused_macros", || {
302 ecx.check_unused_macros();
305 let mut missing_fragment_specifiers: Vec<_> =
306 ecx.parse_sess.missing_fragment_specifiers.borrow().iter().cloned().collect();
307 missing_fragment_specifiers.sort();
309 for span in missing_fragment_specifiers {
310 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
311 let msg = "missing fragment specifier";
312 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
315 env::set_var("PATH", &old_path);
320 sess.time("maybe_building_test_harness", || {
321 rustc_builtin_macros::test_harness::inject(
327 &sess.features_untracked(),
328 sess.panic_strategy(),
329 sess.target.target.options.panic_strategy,
330 sess.opts.debugging_opts.panic_abort_tests,
334 // If we're actually rustdoc then there's no need to actually compile
335 // anything, so switch everything to just looping
336 let mut should_loop = sess.opts.actually_rustdoc;
337 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
341 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
344 let has_proc_macro_decls = sess.time("AST_validation", || {
345 rustc_ast_passes::ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
348 let crate_types = sess.crate_types.borrow();
349 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
351 // For backwards compatibility, we don't try to run proc macro injection
352 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
353 // specified. This should only affect users who manually invoke 'rustdoc', as
354 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
355 // However, we do emit a warning, to let such users know that they should
356 // start passing '--crate-type proc-macro'
357 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
358 let mut msg = sess.diagnostic().struct_warn(
359 &"Trying to document proc macro crate \
360 without passing '--crate-type proc-macro to rustdoc",
363 msg.warn("The generated documentation may be incorrect");
366 krate = sess.time("maybe_create_a_macro_crate", || {
367 let num_crate_types = crate_types.len();
368 let is_test_crate = sess.opts.test;
369 rustc_builtin_macros::proc_macro_harness::inject(
374 has_proc_macro_decls,
382 // Done with macro expansion!
384 if sess.opts.debugging_opts.input_stats {
385 println!("Post-expansion node count: {}", count_nodes(&krate));
388 if sess.opts.debugging_opts.hir_stats {
389 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
392 if sess.opts.debugging_opts.ast_json {
393 println!("{}", json::as_json(&krate));
396 resolver.resolve_crate(&krate);
398 // Needs to go *after* expansion to be able to check the results of macro expansion.
399 sess.time("complete_gated_feature_checking", || {
400 rustc_ast_passes::feature_gate::check_crate(
403 &sess.features_untracked(),
404 sess.opts.unstable_features,
408 // Add all buffered lints from the `ParseSess` to the `Session`.
409 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
410 info!("{} parse sess buffered_lints", buffered_lints.len());
411 for early_lint in buffered_lints.drain(..) {
412 resolver.lint_buffer().add_early_lint(early_lint);
416 Ok((krate, resolver))
419 pub fn lower_to_hir<'res, 'tcx>(
421 lint_store: &LintStore,
422 resolver: &'res mut Resolver<'_>,
423 dep_graph: &'res DepGraph,
424 krate: &'res ast::Crate,
425 arena: &'tcx Arena<'tcx>,
428 let hir_crate = rustc_ast_lowering::lower_crate(
433 rustc_parse::nt_to_tokenstream,
437 if sess.opts.debugging_opts.hir_stats {
438 hir_stats::print_hir_stats(&hir_crate);
441 sess.time("early_lint_checks", || {
442 rustc_lint::check_ast_crate(
447 Some(std::mem::take(resolver.lint_buffer())),
448 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
452 // Discard hygiene data, which isn't required after lowering to HIR.
453 if !sess.opts.debugging_opts.keep_hygiene_data {
454 rustc_span::hygiene::clear_syntax_context_map();
460 // Returns all the paths that correspond to generated files.
461 fn generated_output_paths(
463 outputs: &OutputFilenames,
467 let mut out_filenames = Vec::new();
468 for output_type in sess.opts.output_types.keys() {
469 let file = outputs.path(*output_type);
471 // If the filename has been overridden using `-o`, it will not be modified
472 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
473 OutputType::Exe if !exact_name => {
474 for crate_type in sess.crate_types.borrow().iter() {
475 let p = ::rustc_codegen_utils::link::filename_for_input(
481 out_filenames.push(p);
484 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
485 // Don't add the dep-info output when omitting it from dep-info targets
488 out_filenames.push(file);
495 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
496 // returns None for every file path.
497 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
499 F: Fn(&PathBuf) -> Option<T>,
501 for output_path in output_paths {
502 if let Some(result) = f(output_path) {
509 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
510 let input_path = input_path.canonicalize().ok();
511 if input_path.is_none() {
514 let check = |output_path: &PathBuf| {
515 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
517 check_output(output_paths, check).is_some()
520 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
521 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
522 check_output(output_paths, check)
525 fn escape_dep_filename(filename: &FileName) -> String {
526 // Apparently clang and gcc *only* escape spaces:
527 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
528 filename.to_string().replace(" ", "\\ ")
533 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
534 outputs: &OutputFilenames,
535 out_filenames: &[PathBuf],
537 // Write out dependency rules to the dep-info file if requested
538 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
541 let deps_filename = outputs.path(OutputType::DepInfo);
543 let result = (|| -> io::Result<()> {
544 // Build a list of files used to compile the output and
545 // write Makefile-compatible dependency rules
546 let mut files: Vec<String> = sess
550 .filter(|fmap| fmap.is_real_file())
551 .filter(|fmap| !fmap.is_imported())
552 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
555 if sess.binary_dep_depinfo() {
556 boxed_resolver.borrow().borrow_mut().access(|resolver| {
557 for cnum in resolver.cstore().crates_untracked() {
558 let source = resolver.cstore().crate_source_untracked(cnum);
559 if let Some((path, _)) = source.dylib {
560 files.push(escape_dep_filename(&FileName::Real(path)));
562 if let Some((path, _)) = source.rlib {
563 files.push(escape_dep_filename(&FileName::Real(path)));
565 if let Some((path, _)) = source.rmeta {
566 files.push(escape_dep_filename(&FileName::Real(path)));
572 let mut file = BufWriter::new(fs::File::create(&deps_filename)?);
573 for path in out_filenames {
574 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
577 // Emit a fake target for each input file to the compilation. This
578 // prevents `make` from spitting out an error if a file is later
579 // deleted. For more info see #28735
581 writeln!(file, "{}:", path)?;
588 if sess.opts.json_artifact_notifications {
591 .emit_artifact_notification(&deps_filename, "dep-info");
594 Err(e) => sess.fatal(&format!(
595 "error writing dependencies to `{}`: {}",
596 deps_filename.display(),
602 pub fn prepare_outputs(
606 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
608 ) -> Result<OutputFilenames> {
609 let _timer = sess.timer("prepare_outputs");
611 // FIXME: rustdoc passes &[] instead of &krate.attrs here
612 let outputs = util::build_output_filenames(
614 &compiler.output_dir,
615 &compiler.output_file,
621 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
623 // Ensure the source file isn't accidentally overwritten during compilation.
624 if let Some(ref input_path) = compiler.input_path {
625 if sess.opts.will_create_output_file() {
626 if output_contains_path(&output_paths, input_path) {
628 "the input file \"{}\" would be overwritten by the generated \
632 return Err(ErrorReported);
634 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
636 "the generated executable for the input file \"{}\" conflicts with the \
637 existing directory \"{}\"",
638 input_path.display(),
641 return Err(ErrorReported);
646 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
648 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
649 && sess.opts.output_types.len() == 1;
652 if let Some(ref dir) = compiler.output_dir {
653 if fs::create_dir_all(dir).is_err() {
654 sess.err("failed to find or create the directory specified by `--out-dir`");
655 return Err(ErrorReported);
663 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
664 providers.analysis = analysis;
665 proc_macro_decls::provide(providers);
666 plugin::build::provide(providers);
667 rustc::hir::provide(providers);
668 mir::provide(providers);
669 mir_build::provide(providers);
670 rustc_privacy::provide(providers);
671 typeck::provide(providers);
672 ty::provide(providers);
673 traits::provide(providers);
674 rustc_passes::provide(providers);
675 rustc_resolve::provide(providers);
676 rustc_traits::provide(providers);
677 rustc_ty::provide(providers);
678 rustc_metadata::provide(providers);
679 rustc_lint::provide(providers);
680 rustc_codegen_utils::provide(providers);
681 rustc_codegen_ssa::provide(providers);
684 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
685 rustc_metadata::provide_extern(providers);
686 rustc_codegen_ssa::provide_extern(providers);
689 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
691 impl<'tcx> QueryContext<'tcx> {
692 pub fn enter<F, R>(&mut self, f: F) -> R
694 F: FnOnce(TyCtxt<'tcx>) -> R,
696 ty::tls::enter_global(self.0, |tcx| f(tcx))
699 pub fn print_stats(&mut self) {
700 self.enter(|tcx| ty::query::print_stats(tcx))
704 pub fn create_global_ctxt<'tcx>(
705 compiler: &'tcx Compiler,
706 lint_store: Lrc<LintStore>,
707 krate: &'tcx Crate<'tcx>,
709 mut resolver_outputs: ResolverOutputs,
710 outputs: OutputFilenames,
712 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
713 arena: &'tcx WorkerLocal<Arena<'tcx>>,
714 ) -> QueryContext<'tcx> {
715 let sess = &compiler.session();
716 let defs = mem::take(&mut resolver_outputs.definitions);
718 // Construct the HIR map.
719 let hir_map = map::map_crate(sess, &*resolver_outputs.cstore, krate, dep_graph, defs);
721 let query_result_on_disk_cache = rustc_incremental::load_query_result_cache(sess);
723 let codegen_backend = compiler.codegen_backend();
724 let mut local_providers = ty::query::Providers::default();
725 default_provide(&mut local_providers);
726 codegen_backend.provide(&mut local_providers);
728 let mut extern_providers = local_providers;
729 default_provide_extern(&mut extern_providers);
730 codegen_backend.provide_extern(&mut extern_providers);
732 if let Some(callback) = compiler.override_queries {
733 callback(sess, &mut local_providers, &mut extern_providers);
736 let gcx = sess.time("setup_global_ctxt", || {
737 global_ctxt.init_locking(|| {
738 TyCtxt::create_global_ctxt(
746 query_result_on_disk_cache,
753 // Do some initialization of the DepGraph that can only be done with the tcx available.
754 ty::tls::enter_global(&gcx, |tcx| {
755 tcx.sess.time("dep_graph_tcx_init", || rustc_incremental::dep_graph_tcx_init(tcx));
761 /// Runs the resolution, type-checking, region checking and other
762 /// miscellaneous analysis passes on the crate.
763 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
764 assert_eq!(cnum, LOCAL_CRATE);
767 let mut entry_point = None;
769 sess.time("misc_checking_1", || {
773 .time("looking_for_entry_point", || rustc_passes::entry::find_entry_point(tcx));
775 sess.time("looking_for_plugin_registrar", || {
776 plugin::build::find_plugin_registrar(tcx)
779 sess.time("looking_for_derive_registrar", || proc_macro_decls::find(tcx));
782 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
783 let local_def_id = tcx.hir().local_def_id(module);
784 tcx.ensure().check_mod_loops(local_def_id);
785 tcx.ensure().check_mod_attrs(local_def_id);
786 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
787 tcx.ensure().check_mod_const_bodies(local_def_id);
793 // passes are timed inside typeck
794 typeck::check_crate(tcx)?;
796 sess.time("misc_checking_2", || {
799 sess.time("match_checking", || {
800 tcx.par_body_owners(|def_id| {
801 tcx.ensure().check_match(def_id);
806 sess.time("liveness_and_intrinsic_checking", || {
807 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
808 // this must run before MIR dump, because
809 // "not all control paths return a value" is reported here.
811 // maybe move the check to a MIR pass?
812 let local_def_id = tcx.hir().local_def_id(module);
814 tcx.ensure().check_mod_liveness(local_def_id);
815 tcx.ensure().check_mod_intrinsics(local_def_id);
822 sess.time("MIR_borrow_checking", || {
823 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
826 sess.time("dumping_chalk_like_clauses", || {
827 rustc_traits::lowering::dump_program_clauses(tcx);
830 sess.time("MIR_effect_checking", || {
831 for def_id in tcx.body_owners() {
832 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
836 sess.time("layout_testing", || layout_test::test_layout(tcx));
838 // Avoid overwhelming user with errors if borrow checking failed.
839 // I'm not sure how helpful this is, to be honest, but it avoids a
840 // lot of annoying errors in the compile-fail tests (basically,
841 // lint warnings and so on -- kindck used to do this abort, but
842 // kindck is gone now). -nmatsakis
843 if sess.has_errors() {
844 return Err(ErrorReported);
847 sess.time("misc_checking_3", || {
850 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
854 tcx.ensure().check_private_in_public(LOCAL_CRATE);
857 sess.time("death_checking", || rustc_passes::dead::check_crate(tcx));
860 sess.time("unused_lib_feature_checking", || {
861 rustc_passes::stability::check_unused_or_stable_features(tcx)
865 sess.time("lint_checking", || {
866 rustc_lint::check_crate(tcx, || {
867 rustc_lint::BuiltinCombinedLateLintPass::new()
874 sess.time("privacy_checking_modules", || {
875 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
876 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
886 fn encode_and_write_metadata(
888 outputs: &OutputFilenames,
889 ) -> (middle::cstore::EncodedMetadata, bool) {
890 #[derive(PartialEq, Eq, PartialOrd, Ord)]
897 let metadata_kind = tcx
902 .map(|ty| match *ty {
903 CrateType::Executable | CrateType::Staticlib | CrateType::Cdylib => MetadataKind::None,
905 CrateType::Rlib => MetadataKind::Uncompressed,
907 CrateType::Dylib | CrateType::ProcMacro => MetadataKind::Compressed,
910 .unwrap_or(MetadataKind::None);
912 let metadata = match metadata_kind {
913 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
914 MetadataKind::Uncompressed | MetadataKind::Compressed => tcx.encode_metadata(),
917 let _prof_timer = tcx.sess.prof.generic_activity("write_crate_metadata");
919 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
920 if need_metadata_file {
921 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
922 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
923 // To avoid races with another rustc process scanning the output directory,
924 // we need to write the file somewhere else and atomically move it to its
925 // final destination, with an `fs::rename` call. In order for the rename to
926 // always succeed, the temporary file needs to be on the same filesystem,
927 // which is why we create it inside the output directory specifically.
928 let metadata_tmpdir = TempFileBuilder::new()
930 .tempdir_in(out_filename.parent().unwrap())
931 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
932 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
933 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
934 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
936 if tcx.sess.opts.json_artifact_notifications {
940 .emit_artifact_notification(&out_filename, "metadata");
944 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
946 (metadata, need_metadata_module)
949 /// Runs the codegen backend, after which the AST and analysis can
951 pub fn start_codegen<'tcx>(
952 codegen_backend: &dyn CodegenBackend,
954 outputs: &OutputFilenames,
956 if log_enabled!(::log::Level::Info) {
957 println!("Pre-codegen");
958 tcx.print_debug_stats();
961 let (metadata, need_metadata_module) = encode_and_write_metadata(tcx, outputs);
963 let codegen = tcx.sess.time("codegen_crate", move || {
964 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
967 if log_enabled!(::log::Level::Info) {
968 println!("Post-codegen");
969 tcx.print_debug_stats();
972 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
973 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
974 tcx.sess.err(&format!("could not emit MIR: {}", e));
975 tcx.sess.abort_if_errors();