1 use crate::interface::{Compiler, Result};
3 use crate::proc_macro_decls;
5 use log::{info, warn, log_enabled};
6 use rustc::arena::Arena;
7 use rustc::dep_graph::DepGraph;
9 use rustc::hir::lowering::lower_crate;
10 use rustc::hir::def_id::{CrateNum, LOCAL_CRATE};
12 use rustc::middle::{self, reachable, resolve_lifetime, stability};
13 use rustc::middle::cstore::{CrateStore, MetadataLoader, MetadataLoaderDyn};
14 use rustc::ty::{self, AllArenas, ResolverOutputs, TyCtxt, GlobalCtxt};
15 use rustc::ty::steal::Steal;
17 use rustc::util::common::{time, ErrorReported};
18 use rustc::session::Session;
19 use rustc::session::config::{self, CrateType, Input, OutputFilenames, OutputType};
20 use rustc::session::config::{PpMode, PpSourceMode};
21 use rustc::session::search_paths::PathKind;
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::{box_region_allow_access, declare_box_region_type, parallel};
26 use rustc_data_structures::sync::{Lrc, Once, ParallelIterator, par_iter, WorkerLocal};
27 use rustc_errors::PResult;
28 use rustc_incremental;
30 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
31 use rustc_passes::{self, ast_validation, hir_stats, layout_test};
32 use rustc_plugin_impl as plugin;
34 use rustc_resolve::{Resolver, ResolverArenas};
36 use rustc_typeck as typeck;
37 use syntax::{self, ast, visit};
38 use syntax::early_buffered_lints::BufferedEarlyLint;
39 use syntax_expand::base::ExtCtxt;
40 use syntax::mut_visit::MutVisitor;
41 use syntax::util::node_count::NodeCounter;
42 use syntax::symbol::Symbol;
43 use syntax_pos::FileName;
46 use rustc_serialize::json;
47 use tempfile::Builder as TempFileBuilder;
49 use std::{env, fs, iter, mem};
51 use std::ffi::OsString;
52 use std::io::{self, Write};
53 use std::path::PathBuf;
54 use std::cell::RefCell;
57 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
59 .set_continue_after_error(sess.opts.debugging_opts.continue_parse_after_error);
60 let krate = time(sess, "parsing", || {
61 let _prof_timer = sess.prof.generic_activity("parse_crate");
64 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
65 Input::Str { input, name } => {
66 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
71 sess.diagnostic().set_continue_after_error(true);
73 if sess.opts.debugging_opts.ast_json_noexpand {
74 println!("{}", json::as_json(&krate));
77 if sess.opts.debugging_opts.input_stats {
80 sess.source_map().count_lines()
82 println!("Pre-expansion node count: {}", count_nodes(&krate));
85 if let Some(ref s) = sess.opts.debugging_opts.show_span {
86 syntax::show_span::run(sess.diagnostic(), s, &krate);
89 if sess.opts.debugging_opts.hir_stats {
90 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
96 fn count_nodes(krate: &ast::Crate) -> usize {
97 let mut counter = NodeCounter::new();
98 visit::walk_crate(&mut counter, krate);
102 declare_box_region_type!(
105 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
108 /// Runs the "early phases" of the compiler: initial `cfg` processing, loading compiler plugins,
109 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
110 /// harness if one is to be provided, injection of a dependency on the
111 /// standard library and prelude, and name resolution.
113 /// Returns `None` if we're aborting after handling -W help.
114 pub fn configure_and_expand(
116 lint_store: Lrc<lint::LintStore>,
117 metadata_loader: Box<MetadataLoaderDyn>,
120 ) -> Result<(ast::Crate, BoxedResolver)> {
121 // Currently, we ignore the name resolution data structures for the purposes of dependency
122 // tracking. Instead we will run name resolution and include its output in the hash of each
123 // item, much like we do for macro expansion. In other words, the hash reflects not just
124 // its contents but the results of name resolution on those contents. Hopefully we'll push
125 // this back at some point.
126 let crate_name = crate_name.to_string();
127 let (result, resolver) = BoxedResolver::new(static move || {
129 let resolver_arenas = Resolver::arenas();
130 let res = configure_and_expand_inner(
138 let mut resolver = match res {
140 yield BoxedResolver::initial_yield(Err(v));
143 Ok((krate, resolver)) => {
144 yield BoxedResolver::initial_yield(Ok(krate));
148 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver));
149 resolver.into_outputs()
151 result.map(|k| (k, resolver))
155 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
156 match Rc::try_unwrap(resolver) {
157 Ok(resolver) => resolver.into_inner().complete(),
158 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
163 pub fn register_plugins<'a>(
165 metadata_loader: &'a dyn MetadataLoader,
166 register_lints: impl Fn(&Session, &mut lint::LintStore),
167 mut krate: ast::Crate,
169 ) -> Result<(ast::Crate, Lrc<lint::LintStore>)> {
170 krate = time(sess, "attributes injection", || {
171 syntax_ext::cmdline_attrs::inject(
172 krate, &sess.parse_sess, &sess.opts.debugging_opts.crate_attr
176 let (krate, features) = syntax_expand::config::features(
180 &sess.opts.debugging_opts.allow_features,
182 // these need to be set "early" so that expansion sees `quote` if enabled.
183 sess.init_features(features);
185 let crate_types = util::collect_crate_types(sess, &krate.attrs);
186 sess.crate_types.set(crate_types);
188 let disambiguator = util::compute_crate_disambiguator(sess);
189 sess.crate_disambiguator.set(disambiguator);
190 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
192 if sess.opts.incremental.is_some() {
193 time(sess, "garbage-collect incremental cache directory", || {
195 sess.prof.generic_activity("incr_comp_garbage_collect_session_directories");
196 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
198 "Error while trying to garbage collect incremental \
199 compilation cache directory: {}",
206 time(sess, "recursion limit", || {
207 middle::recursion_limit::update_limits(sess, &krate);
210 let mut lint_store = rustc_lint::new_lint_store(
211 sess.opts.debugging_opts.no_interleave_lints,
212 sess.unstable_options(),
214 register_lints(&sess, &mut lint_store);
216 let registrars = time(sess, "plugin loading", || {
217 plugin::load::load_plugins(sess, metadata_loader, &krate)
219 time(sess, "plugin registration", || {
220 let mut registry = plugin::Registry { lint_store: &mut lint_store };
221 for registrar in registrars {
222 registrar(&mut registry);
226 Ok((krate, Lrc::new(lint_store)))
229 fn configure_and_expand_inner<'a>(
231 lint_store: &'a lint::LintStore,
232 mut krate: ast::Crate,
234 resolver_arenas: &'a ResolverArenas<'a>,
235 metadata_loader: &'a MetadataLoaderDyn,
236 ) -> Result<(ast::Crate, Resolver<'a>)> {
237 time(sess, "pre-AST-expansion lint checks", || {
238 lint::check_ast_crate(
244 rustc_lint::BuiltinCombinedPreExpansionLintPass::new());
247 let mut resolver = Resolver::new(
254 syntax_ext::register_builtin_macros(&mut resolver, sess.edition());
256 krate = time(sess, "crate injection", || {
257 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
258 let (krate, name) = syntax_ext::standard_library_imports::inject(
264 if let Some(name) = name {
265 sess.parse_sess.injected_crate_name.set(name);
270 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
273 krate = time(sess, "expansion", || {
274 let _prof_timer = sess.prof.generic_activity("macro_expand_crate");
275 // Windows dlls do not have rpaths, so they don't know how to find their
276 // dependencies. It's up to us to tell the system where to find all the
277 // dependent dlls. Note that this uses cfg!(windows) as opposed to
278 // targ_cfg because syntax extensions are always loaded for the host
279 // compiler, not for the target.
281 // This is somewhat of an inherently racy operation, however, as
282 // multiple threads calling this function could possibly continue
283 // extending PATH far beyond what it should. To solve this for now we
284 // just don't add any new elements to PATH which are already there
285 // within PATH. This is basically a targeted fix at #17360 for rustdoc
286 // which runs rustc in parallel but has been seen (#33844) to cause
287 // problems with PATH becoming too long.
288 let mut old_path = OsString::new();
290 old_path = env::var_os("PATH").unwrap_or(old_path);
291 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
292 for path in env::split_paths(&old_path) {
293 if !new_path.contains(&path) {
302 .filter(|p| env::join_paths(iter::once(p)).is_ok()),
307 // Create the config for macro expansion
308 let features = sess.features_untracked();
309 let cfg = syntax_expand::expand::ExpansionConfig {
310 features: Some(&features),
311 recursion_limit: *sess.recursion_limit.get(),
312 trace_mac: sess.opts.debugging_opts.trace_macros,
313 should_test: sess.opts.test,
314 ..syntax_expand::expand::ExpansionConfig::default(crate_name.to_string())
317 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
319 // Expand macros now!
320 let krate = time(sess, "expand crate", || {
321 ecx.monotonic_expander().expand_crate(krate)
324 // The rest is error reporting
326 time(sess, "check unused macros", || {
327 ecx.check_unused_macros();
330 let mut missing_fragment_specifiers: Vec<_> = ecx.parse_sess
331 .missing_fragment_specifiers
336 missing_fragment_specifiers.sort();
338 for span in missing_fragment_specifiers {
339 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
340 let msg = "missing fragment specifier";
341 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
344 env::set_var("PATH", &old_path);
349 time(sess, "maybe building test harness", || {
350 syntax_ext::test_harness::inject(
356 &sess.features_untracked(),
357 sess.panic_strategy(),
358 sess.target.target.options.panic_strategy,
359 sess.opts.debugging_opts.panic_abort_tests,
363 // If we're actually rustdoc then there's no need to actually compile
364 // anything, so switch everything to just looping
365 let mut should_loop = sess.opts.actually_rustdoc;
366 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
370 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
373 let has_proc_macro_decls = time(sess, "AST validation", || {
374 ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
378 let crate_types = sess.crate_types.borrow();
379 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
381 // For backwards compatibility, we don't try to run proc macro injection
382 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
383 // specified. This should only affect users who manually invoke 'rustdoc', as
384 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
385 // However, we do emit a warning, to let such users know that they should
386 // start passing '--crate-type proc-macro'
387 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
388 let mut msg = sess.diagnostic().struct_warn(&"Trying to document proc macro crate \
389 without passing '--crate-type proc-macro to rustdoc");
391 msg.warn("The generated documentation may be incorrect");
394 krate = time(sess, "maybe creating a macro crate", || {
395 let num_crate_types = crate_types.len();
396 let is_test_crate = sess.opts.test;
397 syntax_ext::proc_macro_harness::inject(
402 has_proc_macro_decls,
410 // Done with macro expansion!
412 if sess.opts.debugging_opts.input_stats {
413 println!("Post-expansion node count: {}", count_nodes(&krate));
416 if sess.opts.debugging_opts.hir_stats {
417 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
420 if sess.opts.debugging_opts.ast_json {
421 println!("{}", json::as_json(&krate));
424 time(sess, "name resolution", || {
425 resolver.resolve_crate(&krate);
428 // Needs to go *after* expansion to be able to check the results of macro expansion.
429 time(sess, "complete gated feature checking", || {
430 syntax::feature_gate::check_crate(
433 &sess.features_untracked(),
434 sess.opts.unstable_features,
438 // Add all buffered lints from the `ParseSess` to the `Session`.
439 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
440 info!("{} parse sess buffered_lints", buffered_lints.len());
441 for BufferedEarlyLint{id, span, msg, lint_id} in buffered_lints.drain(..) {
442 resolver.lint_buffer().buffer_lint(lint_id, id, span, &msg);
446 Ok((krate, resolver))
451 lint_store: &lint::LintStore,
452 resolver: &mut Resolver<'_>,
453 dep_graph: &DepGraph,
455 ) -> Result<hir::map::Forest> {
457 let hir_forest = time(sess, "lowering AST -> HIR", || {
458 let nt_to_tokenstream = rustc_parse::nt_to_tokenstream;
459 let hir_crate = lower_crate(sess, &dep_graph, &krate, resolver, nt_to_tokenstream);
461 if sess.opts.debugging_opts.hir_stats {
462 hir_stats::print_hir_stats(&hir_crate);
465 hir::map::Forest::new(hir_crate, &dep_graph)
468 time(sess, "early lint checks", || {
469 lint::check_ast_crate(
474 Some(std::mem::take(resolver.lint_buffer())),
475 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
479 // Discard hygiene data, which isn't required after lowering to HIR.
480 if !sess.opts.debugging_opts.keep_hygiene_data {
481 syntax_pos::hygiene::clear_syntax_context_map();
487 // Returns all the paths that correspond to generated files.
488 fn generated_output_paths(
490 outputs: &OutputFilenames,
494 let mut out_filenames = Vec::new();
495 for output_type in sess.opts.output_types.keys() {
496 let file = outputs.path(*output_type);
498 // If the filename has been overridden using `-o`, it will not be modified
499 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
500 OutputType::Exe if !exact_name => for crate_type in sess.crate_types.borrow().iter() {
501 let p = ::rustc_codegen_utils::link::filename_for_input(
507 out_filenames.push(p);
509 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
510 // Don't add the dep-info output when omitting it from dep-info targets
513 out_filenames.push(file);
520 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
521 // returns None for every file path.
522 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
524 F: Fn(&PathBuf) -> Option<T>,
526 for output_path in output_paths {
527 if let Some(result) = f(output_path) {
534 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
535 let input_path = input_path.canonicalize().ok();
536 if input_path.is_none() {
539 let check = |output_path: &PathBuf| {
540 if output_path.canonicalize().ok() == input_path {
546 check_output(output_paths, check).is_some()
549 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
550 let check = |output_path: &PathBuf| {
551 if output_path.is_dir() {
552 Some(output_path.clone())
557 check_output(output_paths, check)
560 fn escape_dep_filename(filename: &FileName) -> String {
561 // Apparently clang and gcc *only* escape spaces:
562 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
563 filename.to_string().replace(" ", "\\ ")
568 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
569 outputs: &OutputFilenames,
570 out_filenames: &[PathBuf],
572 // Write out dependency rules to the dep-info file if requested
573 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
576 let deps_filename = outputs.path(OutputType::DepInfo);
578 let result = (|| -> io::Result<()> {
579 // Build a list of files used to compile the output and
580 // write Makefile-compatible dependency rules
581 let mut files: Vec<String> = sess.source_map()
584 .filter(|fmap| fmap.is_real_file())
585 .filter(|fmap| !fmap.is_imported())
586 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
589 if sess.binary_dep_depinfo() {
590 boxed_resolver.borrow().borrow_mut().access(|resolver| {
591 for cnum in resolver.cstore().crates_untracked() {
592 let source = resolver.cstore().crate_source_untracked(cnum);
593 if let Some((path, _)) = source.dylib {
594 files.push(escape_dep_filename(&FileName::Real(path)));
596 if let Some((path, _)) = source.rlib {
597 files.push(escape_dep_filename(&FileName::Real(path)));
599 if let Some((path, _)) = source.rmeta {
600 files.push(escape_dep_filename(&FileName::Real(path)));
606 let mut file = fs::File::create(&deps_filename)?;
607 for path in out_filenames {
608 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
611 // Emit a fake target for each input file to the compilation. This
612 // prevents `make` from spitting out an error if a file is later
613 // deleted. For more info see #28735
615 writeln!(file, "{}:", path)?;
622 if sess.opts.json_artifact_notifications {
623 sess.parse_sess.span_diagnostic
624 .emit_artifact_notification(&deps_filename, "dep-info");
629 "error writing dependencies to `{}`: {}",
630 deps_filename.display(),
637 pub fn prepare_outputs(
641 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
643 ) -> Result<OutputFilenames> {
644 // FIXME: rustdoc passes &[] instead of &krate.attrs here
645 let outputs = util::build_output_filenames(
647 &compiler.output_dir,
648 &compiler.output_file,
653 let output_paths = generated_output_paths(
656 compiler.output_file.is_some(),
660 // Ensure the source file isn't accidentally overwritten during compilation.
661 if let Some(ref input_path) = compiler.input_path {
662 if sess.opts.will_create_output_file() {
663 if output_contains_path(&output_paths, input_path) {
665 "the input file \"{}\" would be overwritten by the generated \
669 return Err(ErrorReported);
671 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
673 "the generated executable for the input file \"{}\" conflicts with the \
674 existing directory \"{}\"",
675 input_path.display(),
678 return Err(ErrorReported);
683 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
685 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
686 && sess.opts.output_types.len() == 1;
689 if let Some(ref dir) = compiler.output_dir {
690 if fs::create_dir_all(dir).is_err() {
691 sess.err("failed to find or create the directory specified by `--out-dir`");
692 return Err(ErrorReported);
700 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
701 providers.analysis = analysis;
702 proc_macro_decls::provide(providers);
703 plugin::build::provide(providers);
704 hir::provide(providers);
705 mir::provide(providers);
706 reachable::provide(providers);
707 resolve_lifetime::provide(providers);
708 rustc_privacy::provide(providers);
709 typeck::provide(providers);
710 ty::provide(providers);
711 traits::provide(providers);
712 stability::provide(providers);
713 reachable::provide(providers);
714 rustc_passes::provide(providers);
715 rustc_traits::provide(providers);
716 middle::region::provide(providers);
717 rustc_metadata::provide(providers);
718 lint::provide(providers);
719 rustc_lint::provide(providers);
720 rustc_codegen_utils::provide(providers);
721 rustc_codegen_ssa::provide(providers);
724 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
725 rustc_metadata::provide_extern(providers);
726 rustc_codegen_ssa::provide_extern(providers);
729 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
731 impl<'tcx> QueryContext<'tcx> {
732 pub fn enter<F, R>(&mut self, f: F) -> R
734 F: FnOnce(TyCtxt<'tcx>) -> R,
736 ty::tls::enter_global(self.0, |tcx| f(tcx))
739 pub fn print_stats(&self) {
740 self.0.queries.print_stats()
744 pub fn create_global_ctxt<'tcx>(
745 compiler: &'tcx Compiler,
746 lint_store: Lrc<lint::LintStore>,
747 hir_forest: &'tcx hir::map::Forest,
748 mut resolver_outputs: ResolverOutputs,
749 outputs: OutputFilenames,
751 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
752 all_arenas: &'tcx AllArenas,
753 arena: &'tcx WorkerLocal<Arena<'tcx>>,
754 ) -> QueryContext<'tcx> {
755 let sess = &compiler.session();
756 let defs = mem::take(&mut resolver_outputs.definitions);
758 // Construct the HIR map.
759 let hir_map = time(sess, "indexing HIR", || {
760 hir::map::map_crate(sess, &*resolver_outputs.cstore, &hir_forest, defs)
763 let query_result_on_disk_cache = time(sess, "load query result cache", || {
764 rustc_incremental::load_query_result_cache(sess)
767 let codegen_backend = compiler.codegen_backend();
768 let mut local_providers = ty::query::Providers::default();
769 default_provide(&mut local_providers);
770 codegen_backend.provide(&mut local_providers);
772 let mut extern_providers = local_providers;
773 default_provide_extern(&mut extern_providers);
774 codegen_backend.provide_extern(&mut extern_providers);
776 if let Some(callback) = compiler.override_queries {
777 callback(sess, &mut local_providers, &mut extern_providers);
780 let gcx = global_ctxt.init_locking(|| TyCtxt::create_global_ctxt(
789 query_result_on_disk_cache,
794 // Do some initialization of the DepGraph that can only be done with the tcx available.
795 ty::tls::enter_global(&gcx, |tcx| {
796 time(tcx.sess, "dep graph tcx init", || rustc_incremental::dep_graph_tcx_init(tcx));
802 /// Runs the resolution, type-checking, region checking and other
803 /// miscellaneous analysis passes on the crate.
804 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
805 assert_eq!(cnum, LOCAL_CRATE);
808 let mut entry_point = None;
810 time(sess, "misc checking 1", || {
812 entry_point = time(sess, "looking for entry point", || {
813 rustc_passes::entry::find_entry_point(tcx)
816 time(sess, "looking for plugin registrar", || {
817 plugin::build::find_plugin_registrar(tcx)
820 time(sess, "looking for derive registrar", || {
821 proc_macro_decls::find(tcx)
824 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
825 let local_def_id = tcx.hir().local_def_id(module);
826 tcx.ensure().check_mod_loops(local_def_id);
827 tcx.ensure().check_mod_attrs(local_def_id);
828 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
829 tcx.ensure().check_mod_const_bodies(local_def_id);
834 // passes are timed inside typeck
835 typeck::check_crate(tcx)?;
837 time(sess, "misc checking 2", || {
839 time(sess, "match checking", || {
840 tcx.par_body_owners(|def_id| {
841 tcx.ensure().check_match(def_id);
845 time(sess, "liveness checking + intrinsic checking", || {
846 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
847 // this must run before MIR dump, because
848 // "not all control paths return a value" is reported here.
850 // maybe move the check to a MIR pass?
851 let local_def_id = tcx.hir().local_def_id(module);
853 tcx.ensure().check_mod_liveness(local_def_id);
854 tcx.ensure().check_mod_intrinsics(local_def_id);
860 time(sess, "MIR borrow checking", || {
861 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
864 time(sess, "dumping Chalk-like clauses", || {
865 rustc_traits::lowering::dump_program_clauses(tcx);
868 time(sess, "MIR effect checking", || {
869 for def_id in tcx.body_owners() {
870 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
874 time(sess, "layout testing", || layout_test::test_layout(tcx));
876 // Avoid overwhelming user with errors if borrow checking failed.
877 // I'm not sure how helpful this is, to be honest, but it avoids a
878 // lot of annoying errors in the compile-fail tests (basically,
879 // lint warnings and so on -- kindck used to do this abort, but
880 // kindck is gone now). -nmatsakis
881 if sess.has_errors() {
882 return Err(ErrorReported);
885 time(sess, "misc checking 3", || {
887 time(sess, "privacy access levels", || {
888 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
891 time(sess, "private in public", || {
892 tcx.ensure().check_private_in_public(LOCAL_CRATE);
895 time(sess, "death checking", || rustc_passes::dead::check_crate(tcx));
897 time(sess, "unused lib feature checking", || {
898 stability::check_unused_or_stable_features(tcx)
901 time(sess, "lint checking", || {
902 lint::check_crate(tcx, || rustc_lint::BuiltinCombinedLateLintPass::new());
906 time(sess, "privacy checking modules", || {
907 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
908 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
917 fn encode_and_write_metadata(
919 outputs: &OutputFilenames,
920 ) -> (middle::cstore::EncodedMetadata, bool) {
921 #[derive(PartialEq, Eq, PartialOrd, Ord)]
928 let metadata_kind = tcx.sess.crate_types.borrow().iter().map(|ty| {
930 CrateType::Executable |
931 CrateType::Staticlib |
932 CrateType::Cdylib => MetadataKind::None,
934 CrateType::Rlib => MetadataKind::Uncompressed,
937 CrateType::ProcMacro => MetadataKind::Compressed,
939 }).max().unwrap_or(MetadataKind::None);
941 let metadata = match metadata_kind {
942 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
943 MetadataKind::Uncompressed |
944 MetadataKind::Compressed => tcx.encode_metadata(),
947 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
948 if need_metadata_file {
949 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
950 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
951 // To avoid races with another rustc process scanning the output directory,
952 // we need to write the file somewhere else and atomically move it to its
953 // final destination, with an `fs::rename` call. In order for the rename to
954 // always succeed, the temporary file needs to be on the same filesystem,
955 // which is why we create it inside the output directory specifically.
956 let metadata_tmpdir = TempFileBuilder::new()
958 .tempdir_in(out_filename.parent().unwrap())
959 .unwrap_or_else(|err| {
960 tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err))
962 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
963 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
964 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
966 if tcx.sess.opts.json_artifact_notifications {
967 tcx.sess.parse_sess.span_diagnostic
968 .emit_artifact_notification(&out_filename, "metadata");
972 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
974 (metadata, need_metadata_module)
977 /// Runs the codegen backend, after which the AST and analysis can
979 pub fn start_codegen<'tcx>(
980 codegen_backend: &dyn CodegenBackend,
982 outputs: &OutputFilenames,
984 if log_enabled!(::log::Level::Info) {
985 println!("Pre-codegen");
986 tcx.print_debug_stats();
989 let (metadata, need_metadata_module) = time(tcx.sess, "metadata encoding and writing", || {
990 encode_and_write_metadata(tcx, outputs)
993 let codegen = time(tcx.sess, "codegen", move || {
994 let _prof_timer = tcx.prof.generic_activity("codegen_crate");
995 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
998 if log_enabled!(::log::Level::Info) {
999 println!("Post-codegen");
1000 tcx.print_debug_stats();
1003 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
1004 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
1005 tcx.sess.err(&format!("could not emit MIR: {}", e));
1006 tcx.sess.abort_if_errors();