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;
29 use rustc_metadata::cstore;
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;
34 use rustc_plugin_impl::registry::Registry;
36 use rustc_resolve::{Resolver, ResolverArenas};
38 use rustc_typeck as typeck;
39 use syntax::{self, ast, visit};
40 use syntax::early_buffered_lints::BufferedEarlyLint;
41 use syntax_expand::base::ExtCtxt;
42 use syntax::mut_visit::MutVisitor;
43 use syntax::util::node_count::NodeCounter;
44 use syntax::symbol::Symbol;
45 use syntax_pos::FileName;
48 use rustc_serialize::json;
49 use tempfile::Builder as TempFileBuilder;
51 use std::{env, fs, iter, mem};
53 use std::ffi::OsString;
54 use std::io::{self, Write};
55 use std::path::PathBuf;
56 use std::cell::RefCell;
59 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
61 .set_continue_after_error(sess.opts.debugging_opts.continue_parse_after_error);
62 let krate = time(sess, "parsing", || {
63 let _prof_timer = sess.prof.generic_activity("parse_crate");
66 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
67 Input::Str { input, name } => {
68 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
73 sess.diagnostic().set_continue_after_error(true);
75 if sess.opts.debugging_opts.ast_json_noexpand {
76 println!("{}", json::as_json(&krate));
79 if sess.opts.debugging_opts.input_stats {
82 sess.source_map().count_lines()
84 println!("Pre-expansion node count: {}", count_nodes(&krate));
87 if let Some(ref s) = sess.opts.debugging_opts.show_span {
88 syntax::show_span::run(sess.diagnostic(), s, &krate);
91 if sess.opts.debugging_opts.hir_stats {
92 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
98 fn count_nodes(krate: &ast::Crate) -> usize {
99 let mut counter = NodeCounter::new();
100 visit::walk_crate(&mut counter, krate);
104 declare_box_region_type!(
107 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
110 /// Runs the "early phases" of the compiler: initial `cfg` processing,
111 /// loading compiler plugins (including those from `addl_plugins`),
112 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
113 /// harness if one is to be provided, injection of a dependency on the
114 /// standard library and prelude, and name resolution.
116 /// Returns `None` if we're aborting after handling -W help.
117 pub fn configure_and_expand(
119 lint_store: Lrc<lint::LintStore>,
120 metadata_loader: Box<MetadataLoaderDyn>,
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(
141 let mut resolver = match res {
143 yield BoxedResolver::initial_yield(Err(v));
146 Ok((krate, resolver)) => {
147 yield BoxedResolver::initial_yield(Ok(krate));
151 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver));
152 resolver.into_outputs()
154 result.map(|k| (k, resolver))
158 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
159 match Rc::try_unwrap(resolver) {
160 Ok(resolver) => resolver.into_inner().complete(),
161 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
166 pub fn register_plugins<'a>(
168 metadata_loader: &'a dyn MetadataLoader,
169 register_lints: impl Fn(&Session, &mut lint::LintStore),
170 mut krate: ast::Crate,
172 ) -> Result<(ast::Crate, Lrc<lint::LintStore>)> {
173 krate = time(sess, "attributes injection", || {
174 syntax_ext::cmdline_attrs::inject(
175 krate, &sess.parse_sess, &sess.opts.debugging_opts.crate_attr
179 let (krate, features) = syntax_expand::config::features(
183 &sess.opts.debugging_opts.allow_features,
185 // these need to be set "early" so that expansion sees `quote` if enabled.
186 sess.init_features(features);
188 let crate_types = util::collect_crate_types(sess, &krate.attrs);
189 sess.crate_types.set(crate_types);
191 let disambiguator = util::compute_crate_disambiguator(sess);
192 sess.crate_disambiguator.set(disambiguator);
193 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
195 if sess.opts.incremental.is_some() {
196 time(sess, "garbage-collect incremental cache directory", || {
198 sess.prof.generic_activity("incr_comp_garbage_collect_session_directories");
199 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
201 "Error while trying to garbage collect incremental \
202 compilation cache directory: {}",
209 time(sess, "recursion limit", || {
210 middle::recursion_limit::update_limits(sess, &krate);
213 let registrars = time(sess, "plugin loading", || {
214 plugin::load::load_plugins(
218 Some(sess.opts.debugging_opts.extra_plugins.clone()),
222 let mut lint_store = rustc_lint::new_lint_store(
223 sess.opts.debugging_opts.no_interleave_lints,
224 sess.unstable_options(),
227 (register_lints)(&sess, &mut lint_store);
229 let mut registry = Registry::new(sess, &mut lint_store, krate.span);
231 time(sess, "plugin registration", || {
232 for registrar in registrars {
233 registry.args_hidden = Some(registrar.args);
234 (registrar.fun)(&mut registry);
238 *sess.plugin_llvm_passes.borrow_mut() = registry.llvm_passes;
240 Ok((krate, Lrc::new(lint_store)))
243 fn configure_and_expand_inner<'a>(
245 lint_store: &'a lint::LintStore,
246 mut krate: ast::Crate,
248 resolver_arenas: &'a ResolverArenas<'a>,
249 metadata_loader: &'a MetadataLoaderDyn,
250 ) -> Result<(ast::Crate, Resolver<'a>)> {
251 time(sess, "pre-AST-expansion lint checks", || {
252 lint::check_ast_crate(
258 rustc_lint::BuiltinCombinedPreExpansionLintPass::new());
261 let mut resolver = Resolver::new(
268 syntax_ext::register_builtin_macros(&mut resolver, sess.edition());
270 krate = time(sess, "crate injection", || {
271 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
272 let (krate, name) = syntax_ext::standard_library_imports::inject(
278 if let Some(name) = name {
279 sess.parse_sess.injected_crate_name.set(name);
284 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
287 krate = time(sess, "expansion", || {
288 let _prof_timer = sess.prof.generic_activity("macro_expand_crate");
289 // Windows dlls do not have rpaths, so they don't know how to find their
290 // dependencies. It's up to us to tell the system where to find all the
291 // dependent dlls. Note that this uses cfg!(windows) as opposed to
292 // targ_cfg because syntax extensions are always loaded for the host
293 // compiler, not for the target.
295 // This is somewhat of an inherently racy operation, however, as
296 // multiple threads calling this function could possibly continue
297 // extending PATH far beyond what it should. To solve this for now we
298 // just don't add any new elements to PATH which are already there
299 // within PATH. This is basically a targeted fix at #17360 for rustdoc
300 // which runs rustc in parallel but has been seen (#33844) to cause
301 // problems with PATH becoming too long.
302 let mut old_path = OsString::new();
304 old_path = env::var_os("PATH").unwrap_or(old_path);
305 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
306 for path in env::split_paths(&old_path) {
307 if !new_path.contains(&path) {
316 .filter(|p| env::join_paths(iter::once(p)).is_ok()),
321 // Create the config for macro expansion
322 let features = sess.features_untracked();
323 let cfg = syntax_expand::expand::ExpansionConfig {
324 features: Some(&features),
325 recursion_limit: *sess.recursion_limit.get(),
326 trace_mac: sess.opts.debugging_opts.trace_macros,
327 should_test: sess.opts.test,
328 ..syntax_expand::expand::ExpansionConfig::default(crate_name.to_string())
331 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
333 // Expand macros now!
334 let krate = time(sess, "expand crate", || {
335 ecx.monotonic_expander().expand_crate(krate)
338 // The rest is error reporting
340 time(sess, "check unused macros", || {
341 ecx.check_unused_macros();
344 let mut missing_fragment_specifiers: Vec<_> = ecx.parse_sess
345 .missing_fragment_specifiers
350 missing_fragment_specifiers.sort();
352 for span in missing_fragment_specifiers {
353 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
354 let msg = "missing fragment specifier";
355 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
358 env::set_var("PATH", &old_path);
363 time(sess, "maybe building test harness", || {
364 syntax_ext::test_harness::inject(
370 &sess.features_untracked(),
371 sess.panic_strategy(),
372 sess.target.target.options.panic_strategy,
373 sess.opts.debugging_opts.panic_abort_tests,
377 // If we're actually rustdoc then there's no need to actually compile
378 // anything, so switch everything to just looping
379 let mut should_loop = sess.opts.actually_rustdoc;
380 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
384 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
387 let has_proc_macro_decls = time(sess, "AST validation", || {
388 ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
392 let crate_types = sess.crate_types.borrow();
393 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
395 // For backwards compatibility, we don't try to run proc macro injection
396 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
397 // specified. This should only affect users who manually invoke 'rustdoc', as
398 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
399 // However, we do emit a warning, to let such users know that they should
400 // start passing '--crate-type proc-macro'
401 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
402 let mut msg = sess.diagnostic().struct_warn(&"Trying to document proc macro crate \
403 without passing '--crate-type proc-macro to rustdoc");
405 msg.warn("The generated documentation may be incorrect");
408 krate = time(sess, "maybe creating a macro crate", || {
409 let num_crate_types = crate_types.len();
410 let is_test_crate = sess.opts.test;
411 syntax_ext::proc_macro_harness::inject(
416 has_proc_macro_decls,
424 // Done with macro expansion!
426 if sess.opts.debugging_opts.input_stats {
427 println!("Post-expansion node count: {}", count_nodes(&krate));
430 if sess.opts.debugging_opts.hir_stats {
431 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
434 if sess.opts.debugging_opts.ast_json {
435 println!("{}", json::as_json(&krate));
438 time(sess, "name resolution", || {
439 resolver.resolve_crate(&krate);
442 // Needs to go *after* expansion to be able to check the results of macro expansion.
443 time(sess, "complete gated feature checking", || {
444 syntax::feature_gate::check_crate(
447 &sess.features_untracked(),
448 sess.opts.unstable_features,
452 // Add all buffered lints from the `ParseSess` to the `Session`.
453 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
454 info!("{} parse sess buffered_lints", buffered_lints.len());
455 for BufferedEarlyLint{id, span, msg, lint_id} in buffered_lints.drain(..) {
456 let lint = lint::Lint::from_parser_lint_id(lint_id);
457 resolver.lint_buffer().buffer_lint(lint, id, span, &msg);
461 Ok((krate, resolver))
466 lint_store: &lint::LintStore,
467 resolver: &mut Resolver<'_>,
468 dep_graph: &DepGraph,
470 ) -> Result<hir::map::Forest> {
472 let hir_forest = time(sess, "lowering AST -> HIR", || {
473 let nt_to_tokenstream = rustc_parse::nt_to_tokenstream;
474 let hir_crate = lower_crate(sess, &dep_graph, &krate, resolver, nt_to_tokenstream);
476 if sess.opts.debugging_opts.hir_stats {
477 hir_stats::print_hir_stats(&hir_crate);
480 hir::map::Forest::new(hir_crate, &dep_graph)
483 time(sess, "early lint checks", || {
484 lint::check_ast_crate(
489 Some(std::mem::take(resolver.lint_buffer())),
490 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
494 // Discard hygiene data, which isn't required after lowering to HIR.
495 if !sess.opts.debugging_opts.keep_hygiene_data {
496 syntax_pos::hygiene::clear_syntax_context_map();
502 // Returns all the paths that correspond to generated files.
503 fn generated_output_paths(
505 outputs: &OutputFilenames,
509 let mut out_filenames = Vec::new();
510 for output_type in sess.opts.output_types.keys() {
511 let file = outputs.path(*output_type);
513 // If the filename has been overridden using `-o`, it will not be modified
514 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
515 OutputType::Exe if !exact_name => for crate_type in sess.crate_types.borrow().iter() {
516 let p = ::rustc_codegen_utils::link::filename_for_input(
522 out_filenames.push(p);
524 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
525 // Don't add the dep-info output when omitting it from dep-info targets
528 out_filenames.push(file);
535 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
536 // returns None for every file path.
537 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
539 F: Fn(&PathBuf) -> Option<T>,
541 for output_path in output_paths {
542 if let Some(result) = f(output_path) {
549 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
550 let input_path = input_path.canonicalize().ok();
551 if input_path.is_none() {
554 let check = |output_path: &PathBuf| {
555 if output_path.canonicalize().ok() == input_path {
561 check_output(output_paths, check).is_some()
564 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
565 let check = |output_path: &PathBuf| {
566 if output_path.is_dir() {
567 Some(output_path.clone())
572 check_output(output_paths, check)
575 fn escape_dep_filename(filename: &FileName) -> String {
576 // Apparently clang and gcc *only* escape spaces:
577 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
578 filename.to_string().replace(" ", "\\ ")
583 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
584 outputs: &OutputFilenames,
585 out_filenames: &[PathBuf],
587 // Write out dependency rules to the dep-info file if requested
588 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
591 let deps_filename = outputs.path(OutputType::DepInfo);
593 let result = (|| -> io::Result<()> {
594 // Build a list of files used to compile the output and
595 // write Makefile-compatible dependency rules
596 let mut files: Vec<String> = sess.source_map()
599 .filter(|fmap| fmap.is_real_file())
600 .filter(|fmap| !fmap.is_imported())
601 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
604 if sess.binary_dep_depinfo() {
605 boxed_resolver.borrow().borrow_mut().access(|resolver| {
606 for cnum in resolver.cstore().crates_untracked() {
607 let source = resolver.cstore().crate_source_untracked(cnum);
608 if let Some((path, _)) = source.dylib {
609 files.push(escape_dep_filename(&FileName::Real(path)));
611 if let Some((path, _)) = source.rlib {
612 files.push(escape_dep_filename(&FileName::Real(path)));
614 if let Some((path, _)) = source.rmeta {
615 files.push(escape_dep_filename(&FileName::Real(path)));
621 let mut file = fs::File::create(&deps_filename)?;
622 for path in out_filenames {
623 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
626 // Emit a fake target for each input file to the compilation. This
627 // prevents `make` from spitting out an error if a file is later
628 // deleted. For more info see #28735
630 writeln!(file, "{}:", path)?;
637 if sess.opts.json_artifact_notifications {
638 sess.parse_sess.span_diagnostic
639 .emit_artifact_notification(&deps_filename, "dep-info");
644 "error writing dependencies to `{}`: {}",
645 deps_filename.display(),
652 pub fn prepare_outputs(
656 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
658 ) -> Result<OutputFilenames> {
659 // FIXME: rustdoc passes &[] instead of &krate.attrs here
660 let outputs = util::build_output_filenames(
662 &compiler.output_dir,
663 &compiler.output_file,
668 let output_paths = generated_output_paths(
671 compiler.output_file.is_some(),
675 // Ensure the source file isn't accidentally overwritten during compilation.
676 if let Some(ref input_path) = compiler.input_path {
677 if sess.opts.will_create_output_file() {
678 if output_contains_path(&output_paths, input_path) {
680 "the input file \"{}\" would be overwritten by the generated \
684 return Err(ErrorReported);
686 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
688 "the generated executable for the input file \"{}\" conflicts with the \
689 existing directory \"{}\"",
690 input_path.display(),
693 return Err(ErrorReported);
698 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
700 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
701 && sess.opts.output_types.len() == 1;
704 if let Some(ref dir) = compiler.output_dir {
705 if fs::create_dir_all(dir).is_err() {
706 sess.err("failed to find or create the directory specified by `--out-dir`");
707 return Err(ErrorReported);
715 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
716 providers.analysis = analysis;
717 proc_macro_decls::provide(providers);
718 plugin::build::provide(providers);
719 hir::provide(providers);
720 mir::provide(providers);
721 reachable::provide(providers);
722 resolve_lifetime::provide(providers);
723 rustc_privacy::provide(providers);
724 typeck::provide(providers);
725 ty::provide(providers);
726 traits::provide(providers);
727 stability::provide(providers);
728 reachable::provide(providers);
729 rustc_passes::provide(providers);
730 rustc_traits::provide(providers);
731 middle::region::provide(providers);
732 cstore::provide(providers);
733 lint::provide(providers);
734 rustc_lint::provide(providers);
735 rustc_codegen_utils::provide(providers);
736 rustc_codegen_ssa::provide(providers);
739 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
740 cstore::provide_extern(providers);
741 rustc_codegen_ssa::provide_extern(providers);
744 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
746 impl<'tcx> QueryContext<'tcx> {
747 pub fn enter<F, R>(&mut self, f: F) -> R
749 F: FnOnce(TyCtxt<'tcx>) -> R,
751 ty::tls::enter_global(self.0, |tcx| f(tcx))
754 pub fn print_stats(&self) {
755 self.0.queries.print_stats()
759 pub fn create_global_ctxt<'tcx>(
760 compiler: &'tcx Compiler,
761 lint_store: Lrc<lint::LintStore>,
762 hir_forest: &'tcx hir::map::Forest,
763 mut resolver_outputs: ResolverOutputs,
764 outputs: OutputFilenames,
766 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
767 arenas: &'tcx Once<AllArenas>,
768 local_arena: &'tcx WorkerLocal<Arena<'tcx>>,
769 ) -> QueryContext<'tcx> {
770 let sess = &compiler.session();
771 let defs = mem::take(&mut resolver_outputs.definitions);
773 // Construct the HIR map.
774 let hir_map = time(sess, "indexing HIR", || {
775 hir::map::map_crate(sess, &*resolver_outputs.cstore, &hir_forest, defs)
778 let query_result_on_disk_cache = time(sess, "load query result cache", || {
779 rustc_incremental::load_query_result_cache(sess)
782 let codegen_backend = compiler.codegen_backend();
783 let mut local_providers = ty::query::Providers::default();
784 default_provide(&mut local_providers);
785 codegen_backend.provide(&mut local_providers);
787 let mut extern_providers = local_providers;
788 default_provide_extern(&mut extern_providers);
789 codegen_backend.provide_extern(&mut extern_providers);
791 let override_queries = compiler.override_queries;
792 if let Some(callback) = override_queries {
793 callback(sess, &mut local_providers, &mut extern_providers);
796 let arenas = arenas.init_locking(|| AllArenas::new());
797 let gcx = global_ctxt.init_locking(|| TyCtxt::create_global_ctxt(
806 query_result_on_disk_cache,
811 // Do some initialization of the DepGraph that can only be done with the tcx available.
812 ty::tls::enter_global(&gcx, |tcx| {
813 time(tcx.sess, "dep graph tcx init", || rustc_incremental::dep_graph_tcx_init(tcx));
819 /// Runs the resolution, type-checking, region checking and other
820 /// miscellaneous analysis passes on the crate.
821 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
822 assert_eq!(cnum, LOCAL_CRATE);
825 let mut entry_point = None;
827 time(sess, "misc checking 1", || {
829 entry_point = time(sess, "looking for entry point", || {
830 rustc_passes::entry::find_entry_point(tcx)
833 time(sess, "looking for plugin registrar", || {
834 plugin::build::find_plugin_registrar(tcx)
837 time(sess, "looking for derive registrar", || {
838 proc_macro_decls::find(tcx)
841 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
842 let local_def_id = tcx.hir().local_def_id(module);
843 tcx.ensure().check_mod_loops(local_def_id);
844 tcx.ensure().check_mod_attrs(local_def_id);
845 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
846 tcx.ensure().check_mod_const_bodies(local_def_id);
851 // passes are timed inside typeck
852 typeck::check_crate(tcx)?;
854 time(sess, "misc checking 2", || {
856 time(sess, "match checking", || {
857 tcx.par_body_owners(|def_id| {
858 tcx.ensure().check_match(def_id);
862 time(sess, "liveness checking + intrinsic checking", || {
863 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
864 // this must run before MIR dump, because
865 // "not all control paths return a value" is reported here.
867 // maybe move the check to a MIR pass?
868 let local_def_id = tcx.hir().local_def_id(module);
870 tcx.ensure().check_mod_liveness(local_def_id);
871 tcx.ensure().check_mod_intrinsics(local_def_id);
877 time(sess, "MIR borrow checking", || {
878 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
881 time(sess, "dumping Chalk-like clauses", || {
882 rustc_traits::lowering::dump_program_clauses(tcx);
885 time(sess, "MIR effect checking", || {
886 for def_id in tcx.body_owners() {
887 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
891 time(sess, "layout testing", || layout_test::test_layout(tcx));
893 // Avoid overwhelming user with errors if borrow checking failed.
894 // I'm not sure how helpful this is, to be honest, but it avoids a
895 // lot of annoying errors in the compile-fail tests (basically,
896 // lint warnings and so on -- kindck used to do this abort, but
897 // kindck is gone now). -nmatsakis
898 if sess.has_errors() {
899 return Err(ErrorReported);
902 time(sess, "misc checking 3", || {
904 time(sess, "privacy access levels", || {
905 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
908 time(sess, "private in public", || {
909 tcx.ensure().check_private_in_public(LOCAL_CRATE);
912 time(sess, "death checking", || rustc_passes::dead::check_crate(tcx));
914 time(sess, "unused lib feature checking", || {
915 stability::check_unused_or_stable_features(tcx)
918 time(sess, "lint checking", || {
919 lint::check_crate(tcx, || rustc_lint::BuiltinCombinedLateLintPass::new());
923 time(sess, "privacy checking modules", || {
924 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
925 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
934 fn encode_and_write_metadata(
936 outputs: &OutputFilenames,
937 ) -> (middle::cstore::EncodedMetadata, bool) {
938 #[derive(PartialEq, Eq, PartialOrd, Ord)]
945 let metadata_kind = tcx.sess.crate_types.borrow().iter().map(|ty| {
947 CrateType::Executable |
948 CrateType::Staticlib |
949 CrateType::Cdylib => MetadataKind::None,
951 CrateType::Rlib => MetadataKind::Uncompressed,
954 CrateType::ProcMacro => MetadataKind::Compressed,
956 }).max().unwrap_or(MetadataKind::None);
958 let metadata = match metadata_kind {
959 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
960 MetadataKind::Uncompressed |
961 MetadataKind::Compressed => tcx.encode_metadata(),
964 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
965 if need_metadata_file {
966 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
967 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
968 // To avoid races with another rustc process scanning the output directory,
969 // we need to write the file somewhere else and atomically move it to its
970 // final destination, with an `fs::rename` call. In order for the rename to
971 // always succeed, the temporary file needs to be on the same filesystem,
972 // which is why we create it inside the output directory specifically.
973 let metadata_tmpdir = TempFileBuilder::new()
975 .tempdir_in(out_filename.parent().unwrap())
976 .unwrap_or_else(|err| {
977 tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err))
979 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
980 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
981 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
983 if tcx.sess.opts.json_artifact_notifications {
984 tcx.sess.parse_sess.span_diagnostic
985 .emit_artifact_notification(&out_filename, "metadata");
989 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
991 (metadata, need_metadata_module)
994 /// Runs the codegen backend, after which the AST and analysis can
996 pub fn start_codegen<'tcx>(
997 codegen_backend: &dyn CodegenBackend,
999 outputs: &OutputFilenames,
1001 if log_enabled!(::log::Level::Info) {
1002 println!("Pre-codegen");
1003 tcx.print_debug_stats();
1006 let (metadata, need_metadata_module) = time(tcx.sess, "metadata encoding and writing", || {
1007 encode_and_write_metadata(tcx, outputs)
1010 let codegen = time(tcx.sess, "codegen", move || {
1011 let _prof_timer = tcx.prof.generic_activity("codegen_crate");
1012 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
1015 if log_enabled!(::log::Level::Info) {
1016 println!("Post-codegen");
1017 tcx.print_debug_stats();
1020 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
1021 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
1022 tcx.sess.err(&format!("could not emit MIR: {}", e));
1023 tcx.sess.abort_if_errors();