1 use crate::interface::{Compiler, Result};
3 use crate::proc_macro_decls;
5 use log::{info, warn, log_enabled};
6 use rustc::dep_graph::DepGraph;
8 use rustc::hir::lowering::lower_crate;
9 use rustc::hir::def_id::{CrateNum, LOCAL_CRATE};
11 use rustc::middle::{self, reachable, resolve_lifetime, stability};
12 use rustc::middle::cstore::{CrateStore, MetadataLoader, MetadataLoaderDyn};
13 use rustc::ty::{self, AllArenas, ResolverOutputs, TyCtxt, GlobalCtxt};
14 use rustc::ty::steal::Steal;
16 use rustc::util::common::{time, ErrorReported};
17 use rustc::session::Session;
18 use rustc::session::config::{self, CrateType, Input, OutputFilenames, OutputType};
19 use rustc::session::search_paths::PathKind;
20 use rustc_codegen_ssa::back::link::emit_metadata;
21 use rustc_codegen_utils::codegen_backend::CodegenBackend;
22 use rustc_codegen_utils::link::filename_for_metadata;
23 use rustc_data_structures::{box_region_allow_access, declare_box_region_type, parallel};
24 use rustc_data_structures::sync::{Lrc, ParallelIterator, par_iter};
25 use rustc_errors::PResult;
26 use rustc_incremental;
27 use rustc_metadata::cstore;
29 use rustc_passes::{self, ast_validation, hir_stats, layout_test};
30 use rustc_plugin as plugin;
31 use rustc_plugin::registry::Registry;
33 use rustc_resolve::{Resolver, ResolverArenas};
35 use rustc_typeck as typeck;
36 use syntax::{self, ast, visit};
37 use syntax::early_buffered_lints::BufferedEarlyLint;
38 use syntax_expand::base::{NamedSyntaxExtension, ExtCtxt};
39 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(ref file) => parse::parse_crate_from_file(file, &sess.parse_sess),
68 } => parse::parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess),
72 sess.diagnostic().set_continue_after_error(true);
74 if sess.opts.debugging_opts.ast_json_noexpand {
75 println!("{}", json::as_json(&krate));
78 if sess.opts.debugging_opts.input_stats {
81 sess.source_map().count_lines()
83 println!("Pre-expansion node count: {}", count_nodes(&krate));
86 if let Some(ref s) = sess.opts.debugging_opts.show_span {
87 syntax::show_span::run(sess.diagnostic(), s, &krate);
90 if sess.opts.debugging_opts.hir_stats {
91 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
97 fn count_nodes(krate: &ast::Crate) -> usize {
98 let mut counter = NodeCounter::new();
99 visit::walk_crate(&mut counter, krate);
103 declare_box_region_type!(
106 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
109 /// Runs the "early phases" of the compiler: initial `cfg` processing,
110 /// loading compiler plugins (including those from `addl_plugins`),
111 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
112 /// harness if one is to be provided, injection of a dependency on the
113 /// standard library and prelude, and name resolution.
115 /// Returns `None` if we're aborting after handling -W help.
116 pub fn configure_and_expand(
118 lint_store: Lrc<lint::LintStore>,
119 metadata_loader: Box<MetadataLoaderDyn>,
122 plugin_info: PluginInfo,
123 ) -> Result<(ast::Crate, BoxedResolver)> {
124 // Currently, we ignore the name resolution data structures for the purposes of dependency
125 // tracking. Instead we will run name resolution and include its output in the hash of each
126 // item, much like we do for macro expansion. In other words, the hash reflects not just
127 // its contents but the results of name resolution on those contents. Hopefully we'll push
128 // this back at some point.
129 let crate_name = crate_name.to_string();
130 let (result, resolver) = BoxedResolver::new(static move || {
132 let resolver_arenas = Resolver::arenas();
133 let res = configure_and_expand_inner(
142 let mut resolver = match res {
144 yield BoxedResolver::initial_yield(Err(v));
147 Ok((krate, resolver)) => {
148 yield BoxedResolver::initial_yield(Ok(krate));
152 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver));
153 resolver.into_outputs()
155 result.map(|k| (k, resolver))
159 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
160 match Rc::try_unwrap(resolver) {
161 Ok(resolver) => resolver.into_inner().complete(),
162 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
167 pub struct PluginInfo {
168 syntax_exts: Vec<NamedSyntaxExtension>,
171 pub fn register_plugins<'a>(
173 metadata_loader: &'a dyn MetadataLoader,
174 register_lints: impl Fn(&Session, &mut lint::LintStore),
175 mut krate: ast::Crate,
177 ) -> Result<(ast::Crate, PluginInfo, Lrc<lint::LintStore>)> {
178 krate = time(sess, "attributes injection", || {
179 syntax_ext::cmdline_attrs::inject(
180 krate, &sess.parse_sess, &sess.opts.debugging_opts.crate_attr
184 let (krate, features) = syntax::config::features(
188 &sess.opts.debugging_opts.allow_features,
190 // these need to be set "early" so that expansion sees `quote` if enabled.
191 sess.init_features(features);
193 let crate_types = util::collect_crate_types(sess, &krate.attrs);
194 sess.crate_types.set(crate_types);
196 let disambiguator = util::compute_crate_disambiguator(sess);
197 sess.crate_disambiguator.set(disambiguator);
198 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
200 if sess.opts.incremental.is_some() {
201 time(sess, "garbage-collect incremental cache directory", || {
203 sess.prof.generic_activity("incr_comp_garbage_collect_session_directories");
204 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
206 "Error while trying to garbage collect incremental \
207 compilation cache directory: {}",
214 time(sess, "recursion limit", || {
215 middle::recursion_limit::update_limits(sess, &krate);
218 let registrars = time(sess, "plugin loading", || {
219 plugin::load::load_plugins(
223 Some(sess.opts.debugging_opts.extra_plugins.clone()),
227 let mut lint_store = rustc_lint::new_lint_store(
228 sess.opts.debugging_opts.no_interleave_lints,
229 sess.unstable_options(),
232 (register_lints)(&sess, &mut lint_store);
234 let mut registry = Registry::new(sess, &mut lint_store, krate.span);
236 time(sess, "plugin registration", || {
237 for registrar in registrars {
238 registry.args_hidden = Some(registrar.args);
239 (registrar.fun)(&mut registry);
250 *sess.plugin_llvm_passes.borrow_mut() = llvm_passes;
251 *sess.plugin_attributes.borrow_mut() = attributes;
253 Ok((krate, PluginInfo { syntax_exts }, Lrc::new(lint_store)))
256 fn configure_and_expand_inner<'a>(
258 lint_store: &'a lint::LintStore,
259 mut krate: ast::Crate,
261 resolver_arenas: &'a ResolverArenas<'a>,
262 metadata_loader: &'a MetadataLoaderDyn,
263 plugin_info: PluginInfo,
264 ) -> Result<(ast::Crate, Resolver<'a>)> {
265 time(sess, "pre-AST-expansion lint checks", || {
266 lint::check_ast_crate(
272 rustc_lint::BuiltinCombinedPreExpansionLintPass::new());
275 let mut resolver = Resolver::new(
282 syntax_ext::register_builtin_macros(&mut resolver, sess.edition());
284 krate = time(sess, "crate injection", || {
285 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
286 let (krate, name) = syntax_ext::standard_library_imports::inject(
292 if let Some(name) = name {
293 sess.parse_sess.injected_crate_name.set(name);
298 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
300 syntax_ext::plugin_macro_defs::inject(
301 &mut krate, &mut resolver, plugin_info.syntax_exts, sess.edition()
305 krate = time(sess, "expansion", || {
306 let _prof_timer = sess.prof.generic_activity("macro_expand_crate");
307 // Windows dlls do not have rpaths, so they don't know how to find their
308 // dependencies. It's up to us to tell the system where to find all the
309 // dependent dlls. Note that this uses cfg!(windows) as opposed to
310 // targ_cfg because syntax extensions are always loaded for the host
311 // compiler, not for the target.
313 // This is somewhat of an inherently racy operation, however, as
314 // multiple threads calling this function could possibly continue
315 // extending PATH far beyond what it should. To solve this for now we
316 // just don't add any new elements to PATH which are already there
317 // within PATH. This is basically a targeted fix at #17360 for rustdoc
318 // which runs rustc in parallel but has been seen (#33844) to cause
319 // problems with PATH becoming too long.
320 let mut old_path = OsString::new();
322 old_path = env::var_os("PATH").unwrap_or(old_path);
323 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
324 for path in env::split_paths(&old_path) {
325 if !new_path.contains(&path) {
334 .filter(|p| env::join_paths(iter::once(p)).is_ok()),
339 // Create the config for macro expansion
340 let features = sess.features_untracked();
341 let cfg = syntax_expand::expand::ExpansionConfig {
342 features: Some(&features),
343 recursion_limit: *sess.recursion_limit.get(),
344 trace_mac: sess.opts.debugging_opts.trace_macros,
345 should_test: sess.opts.test,
346 ..syntax_expand::expand::ExpansionConfig::default(crate_name.to_string())
349 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
351 // Expand macros now!
352 let krate = time(sess, "expand crate", || {
353 ecx.monotonic_expander().expand_crate(krate)
356 // The rest is error reporting
358 time(sess, "check unused macros", || {
359 ecx.check_unused_macros();
362 let mut missing_fragment_specifiers: Vec<_> = ecx.parse_sess
363 .missing_fragment_specifiers
368 missing_fragment_specifiers.sort();
370 for span in missing_fragment_specifiers {
371 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
372 let msg = "missing fragment specifier";
373 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
376 env::set_var("PATH", &old_path);
381 time(sess, "maybe building test harness", || {
382 syntax_ext::test_harness::inject(
388 &sess.features_untracked(),
389 sess.panic_strategy(),
390 sess.target.target.options.panic_strategy,
391 sess.opts.debugging_opts.panic_abort_tests,
395 // If we're actually rustdoc then there's no need to actually compile
396 // anything, so switch everything to just looping
397 if sess.opts.actually_rustdoc {
398 util::ReplaceBodyWithLoop::new(sess).visit_crate(&mut krate);
401 let has_proc_macro_decls = time(sess, "AST validation", || {
402 ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
406 let crate_types = sess.crate_types.borrow();
407 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
409 // For backwards compatibility, we don't try to run proc macro injection
410 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
411 // specified. This should only affect users who manually invoke 'rustdoc', as
412 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
413 // However, we do emit a warning, to let such users know that they should
414 // start passing '--crate-type proc-macro'
415 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
416 let mut msg = sess.diagnostic().struct_warn(&"Trying to document proc macro crate \
417 without passing '--crate-type proc-macro to rustdoc");
419 msg.warn("The generated documentation may be incorrect");
422 krate = time(sess, "maybe creating a macro crate", || {
423 let num_crate_types = crate_types.len();
424 let is_test_crate = sess.opts.test;
425 syntax_ext::proc_macro_harness::inject(
430 has_proc_macro_decls,
438 // Done with macro expansion!
440 if sess.opts.debugging_opts.input_stats {
441 println!("Post-expansion node count: {}", count_nodes(&krate));
444 if sess.opts.debugging_opts.hir_stats {
445 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
448 if sess.opts.debugging_opts.ast_json {
449 println!("{}", json::as_json(&krate));
452 time(sess, "name resolution", || {
453 resolver.resolve_crate(&krate);
456 // Needs to go *after* expansion to be able to check the results of macro expansion.
457 time(sess, "complete gated feature checking", || {
458 syntax::feature_gate::check_crate(
461 &sess.features_untracked(),
462 sess.opts.unstable_features,
466 // Add all buffered lints from the `ParseSess` to the `Session`.
467 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
468 info!("{} parse sess buffered_lints", buffered_lints.len());
469 for BufferedEarlyLint{id, span, msg, lint_id} in buffered_lints.drain(..) {
470 let lint = lint::Lint::from_parser_lint_id(lint_id);
471 resolver.lint_buffer().buffer_lint(lint, id, span, &msg);
475 Ok((krate, resolver))
480 lint_store: &lint::LintStore,
481 resolver: &mut Resolver<'_>,
482 dep_graph: &DepGraph,
484 ) -> Result<hir::map::Forest> {
486 let hir_forest = time(sess, "lowering AST -> HIR", || {
487 let nt_to_tokenstream = syntax::parse::nt_to_tokenstream;
488 let hir_crate = lower_crate(sess, &dep_graph, &krate, resolver, nt_to_tokenstream);
490 if sess.opts.debugging_opts.hir_stats {
491 hir_stats::print_hir_stats(&hir_crate);
494 hir::map::Forest::new(hir_crate, &dep_graph)
497 time(sess, "early lint checks", || {
498 lint::check_ast_crate(
503 Some(std::mem::take(resolver.lint_buffer())),
504 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
508 // Discard hygiene data, which isn't required after lowering to HIR.
509 if !sess.opts.debugging_opts.keep_hygiene_data {
510 syntax_pos::hygiene::clear_syntax_context_map();
516 // Returns all the paths that correspond to generated files.
517 fn generated_output_paths(
519 outputs: &OutputFilenames,
523 let mut out_filenames = Vec::new();
524 for output_type in sess.opts.output_types.keys() {
525 let file = outputs.path(*output_type);
527 // If the filename has been overridden using `-o`, it will not be modified
528 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
529 OutputType::Exe if !exact_name => for crate_type in sess.crate_types.borrow().iter() {
530 let p = ::rustc_codegen_utils::link::filename_for_input(
536 out_filenames.push(p);
538 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
539 // Don't add the dep-info output when omitting it from dep-info targets
542 out_filenames.push(file);
549 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
550 // returns None for every file path.
551 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
553 F: Fn(&PathBuf) -> Option<T>,
555 for output_path in output_paths {
556 if let Some(result) = f(output_path) {
563 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
564 let input_path = input_path.canonicalize().ok();
565 if input_path.is_none() {
568 let check = |output_path: &PathBuf| {
569 if output_path.canonicalize().ok() == input_path {
575 check_output(output_paths, check).is_some()
578 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
579 let check = |output_path: &PathBuf| {
580 if output_path.is_dir() {
581 Some(output_path.clone())
586 check_output(output_paths, check)
589 fn escape_dep_filename(filename: &FileName) -> String {
590 // Apparently clang and gcc *only* escape spaces:
591 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
592 filename.to_string().replace(" ", "\\ ")
597 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
598 outputs: &OutputFilenames,
599 out_filenames: &[PathBuf],
601 // Write out dependency rules to the dep-info file if requested
602 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
605 let deps_filename = outputs.path(OutputType::DepInfo);
607 let result = (|| -> io::Result<()> {
608 // Build a list of files used to compile the output and
609 // write Makefile-compatible dependency rules
610 let mut files: Vec<String> = sess.source_map()
613 .filter(|fmap| fmap.is_real_file())
614 .filter(|fmap| !fmap.is_imported())
615 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
618 if sess.binary_dep_depinfo() {
619 boxed_resolver.borrow().borrow_mut().access(|resolver| {
620 for cnum in resolver.cstore().crates_untracked() {
621 let source = resolver.cstore().crate_source_untracked(cnum);
622 if let Some((path, _)) = source.dylib {
623 files.push(escape_dep_filename(&FileName::Real(path)));
625 if let Some((path, _)) = source.rlib {
626 files.push(escape_dep_filename(&FileName::Real(path)));
628 if let Some((path, _)) = source.rmeta {
629 files.push(escape_dep_filename(&FileName::Real(path)));
635 let mut file = fs::File::create(&deps_filename)?;
636 for path in out_filenames {
637 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
640 // Emit a fake target for each input file to the compilation. This
641 // prevents `make` from spitting out an error if a file is later
642 // deleted. For more info see #28735
644 writeln!(file, "{}:", path)?;
651 if sess.opts.json_artifact_notifications {
652 sess.parse_sess.span_diagnostic
653 .emit_artifact_notification(&deps_filename, "dep-info");
658 "error writing dependencies to `{}`: {}",
659 deps_filename.display(),
666 pub fn prepare_outputs(
670 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
672 ) -> Result<OutputFilenames> {
673 // FIXME: rustdoc passes &[] instead of &krate.attrs here
674 let outputs = util::build_output_filenames(
676 &compiler.output_dir,
677 &compiler.output_file,
682 let output_paths = generated_output_paths(
685 compiler.output_file.is_some(),
689 // Ensure the source file isn't accidentally overwritten during compilation.
690 if let Some(ref input_path) = compiler.input_path {
691 if sess.opts.will_create_output_file() {
692 if output_contains_path(&output_paths, input_path) {
694 "the input file \"{}\" would be overwritten by the generated \
698 return Err(ErrorReported);
700 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
702 "the generated executable for the input file \"{}\" conflicts with the \
703 existing directory \"{}\"",
704 input_path.display(),
707 return Err(ErrorReported);
712 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
714 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
715 && sess.opts.output_types.len() == 1;
718 if let Some(ref dir) = compiler.output_dir {
719 if fs::create_dir_all(dir).is_err() {
720 sess.err("failed to find or create the directory specified by `--out-dir`");
721 return Err(ErrorReported);
729 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
730 providers.analysis = analysis;
731 proc_macro_decls::provide(providers);
732 plugin::build::provide(providers);
733 hir::provide(providers);
734 mir::provide(providers);
735 reachable::provide(providers);
736 resolve_lifetime::provide(providers);
737 rustc_privacy::provide(providers);
738 typeck::provide(providers);
739 ty::provide(providers);
740 traits::provide(providers);
741 stability::provide(providers);
742 reachable::provide(providers);
743 rustc_passes::provide(providers);
744 rustc_traits::provide(providers);
745 middle::region::provide(providers);
746 cstore::provide(providers);
747 lint::provide(providers);
748 rustc_lint::provide(providers);
749 rustc_codegen_utils::provide(providers);
750 rustc_codegen_ssa::provide(providers);
753 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
754 cstore::provide_extern(providers);
755 rustc_codegen_ssa::provide_extern(providers);
758 declare_box_region_type!(
761 (&'tcx GlobalCtxt<'tcx>) -> ((), ())
764 impl BoxedGlobalCtxt {
765 pub fn enter<F, R>(&mut self, f: F) -> R
767 F: for<'tcx> FnOnce(TyCtxt<'tcx>) -> R,
769 self.access(|gcx| ty::tls::enter_global(gcx, |tcx| f(tcx)))
773 pub fn create_global_ctxt(
775 lint_store: Lrc<lint::LintStore>,
776 mut hir_forest: hir::map::Forest,
777 mut resolver_outputs: ResolverOutputs,
778 outputs: OutputFilenames,
780 ) -> BoxedGlobalCtxt {
781 let sess = compiler.session().clone();
782 let codegen_backend = compiler.codegen_backend().clone();
783 let crate_name = crate_name.to_string();
784 let defs = mem::take(&mut resolver_outputs.definitions);
786 let ((), result) = BoxedGlobalCtxt::new(static move || {
789 let global_ctxt: Option<GlobalCtxt<'_>>;
790 let arenas = AllArenas::new();
792 // Construct the HIR map.
793 let hir_map = time(sess, "indexing HIR", || {
794 hir::map::map_crate(sess, &*resolver_outputs.cstore, &mut hir_forest, &defs)
797 let query_result_on_disk_cache = time(sess, "load query result cache", || {
798 rustc_incremental::load_query_result_cache(sess)
801 let mut local_providers = ty::query::Providers::default();
802 default_provide(&mut local_providers);
803 codegen_backend.provide(&mut local_providers);
805 let mut extern_providers = local_providers;
806 default_provide_extern(&mut extern_providers);
807 codegen_backend.provide_extern(&mut extern_providers);
809 let gcx = TyCtxt::create_global_ctxt(
817 query_result_on_disk_cache,
822 global_ctxt = Some(gcx);
823 let gcx = global_ctxt.as_ref().unwrap();
825 ty::tls::enter_global(gcx, |tcx| {
826 // Do some initialization of the DepGraph that can only be done with the
828 time(tcx.sess, "dep graph tcx init", || rustc_incremental::dep_graph_tcx_init(tcx));
831 yield BoxedGlobalCtxt::initial_yield(());
832 box_region_allow_access!(for('tcx), (&'tcx GlobalCtxt<'tcx>), (gcx));
834 if sess.opts.debugging_opts.query_stats {
835 gcx.queries.print_stats();
842 /// Runs the resolution, type-checking, region checking and other
843 /// miscellaneous analysis passes on the crate.
844 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
845 assert_eq!(cnum, LOCAL_CRATE);
848 let mut entry_point = None;
850 time(sess, "misc checking 1", || {
852 entry_point = time(sess, "looking for entry point", || {
853 rustc_passes::entry::find_entry_point(tcx)
856 time(sess, "looking for plugin registrar", || {
857 plugin::build::find_plugin_registrar(tcx)
860 time(sess, "looking for derive registrar", || {
861 proc_macro_decls::find(tcx)
864 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
865 let local_def_id = tcx.hir().local_def_id(module);
866 tcx.ensure().check_mod_loops(local_def_id);
867 tcx.ensure().check_mod_attrs(local_def_id);
868 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
873 // passes are timed inside typeck
874 typeck::check_crate(tcx)?;
876 time(sess, "misc checking 2", || {
878 time(sess, "match checking", || {
879 tcx.par_body_owners(|def_id| {
880 tcx.ensure().check_match(def_id);
884 time(sess, "liveness checking + intrinsic checking", || {
885 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
886 // this must run before MIR dump, because
887 // "not all control paths return a value" is reported here.
889 // maybe move the check to a MIR pass?
890 let local_def_id = tcx.hir().local_def_id(module);
892 tcx.ensure().check_mod_liveness(local_def_id);
893 tcx.ensure().check_mod_intrinsics(local_def_id);
899 time(sess, "MIR borrow checking", || {
900 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
903 time(sess, "dumping Chalk-like clauses", || {
904 rustc_traits::lowering::dump_program_clauses(tcx);
907 time(sess, "MIR effect checking", || {
908 for def_id in tcx.body_owners() {
909 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
913 time(sess, "layout testing", || layout_test::test_layout(tcx));
915 // Avoid overwhelming user with errors if borrow checking failed.
916 // I'm not sure how helpful this is, to be honest, but it avoids a
917 // lot of annoying errors in the compile-fail tests (basically,
918 // lint warnings and so on -- kindck used to do this abort, but
919 // kindck is gone now). -nmatsakis
920 if sess.has_errors() {
921 return Err(ErrorReported);
924 time(sess, "misc checking 3", || {
926 time(sess, "privacy access levels", || {
927 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
930 time(sess, "private in public", || {
931 tcx.ensure().check_private_in_public(LOCAL_CRATE);
934 time(sess, "death checking", || rustc_passes::dead::check_crate(tcx));
936 time(sess, "unused lib feature checking", || {
937 stability::check_unused_or_stable_features(tcx)
940 time(sess, "lint checking", || {
941 lint::check_crate(tcx, || rustc_lint::BuiltinCombinedLateLintPass::new());
945 time(sess, "privacy checking modules", || {
946 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
947 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
956 fn encode_and_write_metadata(
958 outputs: &OutputFilenames,
959 ) -> (middle::cstore::EncodedMetadata, bool) {
960 #[derive(PartialEq, Eq, PartialOrd, Ord)]
967 let metadata_kind = tcx.sess.crate_types.borrow().iter().map(|ty| {
969 CrateType::Executable |
970 CrateType::Staticlib |
971 CrateType::Cdylib => MetadataKind::None,
973 CrateType::Rlib => MetadataKind::Uncompressed,
976 CrateType::ProcMacro => MetadataKind::Compressed,
978 }).max().unwrap_or(MetadataKind::None);
980 let metadata = match metadata_kind {
981 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
982 MetadataKind::Uncompressed |
983 MetadataKind::Compressed => tcx.encode_metadata(),
986 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
987 if need_metadata_file {
988 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
989 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
990 // To avoid races with another rustc process scanning the output directory,
991 // we need to write the file somewhere else and atomically move it to its
992 // final destination, with an `fs::rename` call. In order for the rename to
993 // always succeed, the temporary file needs to be on the same filesystem,
994 // which is why we create it inside the output directory specifically.
995 let metadata_tmpdir = TempFileBuilder::new()
997 .tempdir_in(out_filename.parent().unwrap())
998 .unwrap_or_else(|err| {
999 tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err))
1001 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
1002 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
1003 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
1005 if tcx.sess.opts.json_artifact_notifications {
1006 tcx.sess.parse_sess.span_diagnostic
1007 .emit_artifact_notification(&out_filename, "metadata");
1011 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
1013 (metadata, need_metadata_module)
1016 /// Runs the codegen backend, after which the AST and analysis can
1018 pub fn start_codegen<'tcx>(
1019 codegen_backend: &dyn CodegenBackend,
1021 outputs: &OutputFilenames,
1023 if log_enabled!(::log::Level::Info) {
1024 println!("Pre-codegen");
1025 tcx.print_debug_stats();
1028 let (metadata, need_metadata_module) = time(tcx.sess, "metadata encoding and writing", || {
1029 encode_and_write_metadata(tcx, outputs)
1032 let codegen = time(tcx.sess, "codegen", move || {
1033 let _prof_timer = tcx.prof.generic_activity("codegen_crate");
1034 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
1037 if log_enabled!(::log::Level::Info) {
1038 println!("Post-codegen");
1039 tcx.print_debug_stats();
1042 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
1043 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
1044 tcx.sess.err(&format!("could not emit MIR: {}", e));
1045 tcx.sess.abort_if_errors();