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::config::{PpMode, PpSourceMode};
20 use rustc::session::search_paths::PathKind;
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::{box_region_allow_access, declare_box_region_type, parallel};
25 use rustc_data_structures::sync::{Lrc, ParallelIterator, par_iter};
26 use rustc_errors::PResult;
27 use rustc_incremental;
28 use rustc_metadata::cstore;
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 as plugin;
33 use rustc_plugin::registry::Registry;
35 use rustc_resolve::{Resolver, ResolverArenas};
37 use rustc_typeck as typeck;
38 use syntax::{self, ast, visit};
39 use syntax::early_buffered_lints::BufferedEarlyLint;
40 use syntax_expand::base::{NamedSyntaxExtension, ExtCtxt};
41 use syntax::mut_visit::MutVisitor;
42 use syntax::util::node_count::NodeCounter;
43 use syntax::symbol::Symbol;
44 use syntax_pos::FileName;
47 use rustc_serialize::json;
48 use tempfile::Builder as TempFileBuilder;
50 use std::{env, fs, iter, mem};
52 use std::ffi::OsString;
53 use std::io::{self, Write};
54 use std::path::PathBuf;
55 use std::cell::RefCell;
58 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
60 .set_continue_after_error(sess.opts.debugging_opts.continue_parse_after_error);
61 let krate = time(sess, "parsing", || {
62 let _prof_timer = sess.prof.generic_activity("parse_crate");
65 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
66 Input::Str { input, name } => {
67 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_expand::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 let mut should_loop = sess.opts.actually_rustdoc;
398 if let Some((PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops), _)) = sess.opts.pretty {
402 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
405 let has_proc_macro_decls = time(sess, "AST validation", || {
406 ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
410 let crate_types = sess.crate_types.borrow();
411 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
413 // For backwards compatibility, we don't try to run proc macro injection
414 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
415 // specified. This should only affect users who manually invoke 'rustdoc', as
416 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
417 // However, we do emit a warning, to let such users know that they should
418 // start passing '--crate-type proc-macro'
419 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
420 let mut msg = sess.diagnostic().struct_warn(&"Trying to document proc macro crate \
421 without passing '--crate-type proc-macro to rustdoc");
423 msg.warn("The generated documentation may be incorrect");
426 krate = time(sess, "maybe creating a macro crate", || {
427 let num_crate_types = crate_types.len();
428 let is_test_crate = sess.opts.test;
429 syntax_ext::proc_macro_harness::inject(
434 has_proc_macro_decls,
442 // Done with macro expansion!
444 if sess.opts.debugging_opts.input_stats {
445 println!("Post-expansion node count: {}", count_nodes(&krate));
448 if sess.opts.debugging_opts.hir_stats {
449 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
452 if sess.opts.debugging_opts.ast_json {
453 println!("{}", json::as_json(&krate));
456 time(sess, "name resolution", || {
457 resolver.resolve_crate(&krate);
460 // Needs to go *after* expansion to be able to check the results of macro expansion.
461 time(sess, "complete gated feature checking", || {
462 syntax::feature_gate::check_crate(
465 &sess.features_untracked(),
466 sess.opts.unstable_features,
470 // Add all buffered lints from the `ParseSess` to the `Session`.
471 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
472 info!("{} parse sess buffered_lints", buffered_lints.len());
473 for BufferedEarlyLint{id, span, msg, lint_id} in buffered_lints.drain(..) {
474 let lint = lint::Lint::from_parser_lint_id(lint_id);
475 resolver.lint_buffer().buffer_lint(lint, id, span, &msg);
479 Ok((krate, resolver))
484 lint_store: &lint::LintStore,
485 resolver: &mut Resolver<'_>,
486 dep_graph: &DepGraph,
488 ) -> Result<hir::map::Forest> {
490 let hir_forest = time(sess, "lowering AST -> HIR", || {
491 let nt_to_tokenstream = rustc_parse::nt_to_tokenstream;
492 let hir_crate = lower_crate(sess, &dep_graph, &krate, resolver, nt_to_tokenstream);
494 if sess.opts.debugging_opts.hir_stats {
495 hir_stats::print_hir_stats(&hir_crate);
498 hir::map::Forest::new(hir_crate, &dep_graph)
501 time(sess, "early lint checks", || {
502 lint::check_ast_crate(
507 Some(std::mem::take(resolver.lint_buffer())),
508 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
512 // Discard hygiene data, which isn't required after lowering to HIR.
513 if !sess.opts.debugging_opts.keep_hygiene_data {
514 syntax_pos::hygiene::clear_syntax_context_map();
520 // Returns all the paths that correspond to generated files.
521 fn generated_output_paths(
523 outputs: &OutputFilenames,
527 let mut out_filenames = Vec::new();
528 for output_type in sess.opts.output_types.keys() {
529 let file = outputs.path(*output_type);
531 // If the filename has been overridden using `-o`, it will not be modified
532 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
533 OutputType::Exe if !exact_name => for crate_type in sess.crate_types.borrow().iter() {
534 let p = ::rustc_codegen_utils::link::filename_for_input(
540 out_filenames.push(p);
542 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
543 // Don't add the dep-info output when omitting it from dep-info targets
546 out_filenames.push(file);
553 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
554 // returns None for every file path.
555 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
557 F: Fn(&PathBuf) -> Option<T>,
559 for output_path in output_paths {
560 if let Some(result) = f(output_path) {
567 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
568 let input_path = input_path.canonicalize().ok();
569 if input_path.is_none() {
572 let check = |output_path: &PathBuf| {
573 if output_path.canonicalize().ok() == input_path {
579 check_output(output_paths, check).is_some()
582 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
583 let check = |output_path: &PathBuf| {
584 if output_path.is_dir() {
585 Some(output_path.clone())
590 check_output(output_paths, check)
593 fn escape_dep_filename(filename: &FileName) -> String {
594 // Apparently clang and gcc *only* escape spaces:
595 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
596 filename.to_string().replace(" ", "\\ ")
601 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
602 outputs: &OutputFilenames,
603 out_filenames: &[PathBuf],
605 // Write out dependency rules to the dep-info file if requested
606 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
609 let deps_filename = outputs.path(OutputType::DepInfo);
611 let result = (|| -> io::Result<()> {
612 // Build a list of files used to compile the output and
613 // write Makefile-compatible dependency rules
614 let mut files: Vec<String> = sess.source_map()
617 .filter(|fmap| fmap.is_real_file())
618 .filter(|fmap| !fmap.is_imported())
619 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
622 if sess.binary_dep_depinfo() {
623 boxed_resolver.borrow().borrow_mut().access(|resolver| {
624 for cnum in resolver.cstore().crates_untracked() {
625 let source = resolver.cstore().crate_source_untracked(cnum);
626 if let Some((path, _)) = source.dylib {
627 files.push(escape_dep_filename(&FileName::Real(path)));
629 if let Some((path, _)) = source.rlib {
630 files.push(escape_dep_filename(&FileName::Real(path)));
632 if let Some((path, _)) = source.rmeta {
633 files.push(escape_dep_filename(&FileName::Real(path)));
639 let mut file = fs::File::create(&deps_filename)?;
640 for path in out_filenames {
641 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
644 // Emit a fake target for each input file to the compilation. This
645 // prevents `make` from spitting out an error if a file is later
646 // deleted. For more info see #28735
648 writeln!(file, "{}:", path)?;
655 if sess.opts.json_artifact_notifications {
656 sess.parse_sess.span_diagnostic
657 .emit_artifact_notification(&deps_filename, "dep-info");
662 "error writing dependencies to `{}`: {}",
663 deps_filename.display(),
670 pub fn prepare_outputs(
674 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
676 ) -> Result<OutputFilenames> {
677 // FIXME: rustdoc passes &[] instead of &krate.attrs here
678 let outputs = util::build_output_filenames(
680 &compiler.output_dir,
681 &compiler.output_file,
686 let output_paths = generated_output_paths(
689 compiler.output_file.is_some(),
693 // Ensure the source file isn't accidentally overwritten during compilation.
694 if let Some(ref input_path) = compiler.input_path {
695 if sess.opts.will_create_output_file() {
696 if output_contains_path(&output_paths, input_path) {
698 "the input file \"{}\" would be overwritten by the generated \
702 return Err(ErrorReported);
704 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
706 "the generated executable for the input file \"{}\" conflicts with the \
707 existing directory \"{}\"",
708 input_path.display(),
711 return Err(ErrorReported);
716 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
718 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
719 && sess.opts.output_types.len() == 1;
722 if let Some(ref dir) = compiler.output_dir {
723 if fs::create_dir_all(dir).is_err() {
724 sess.err("failed to find or create the directory specified by `--out-dir`");
725 return Err(ErrorReported);
733 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
734 providers.analysis = analysis;
735 proc_macro_decls::provide(providers);
736 plugin::build::provide(providers);
737 hir::provide(providers);
738 mir::provide(providers);
739 reachable::provide(providers);
740 resolve_lifetime::provide(providers);
741 rustc_privacy::provide(providers);
742 typeck::provide(providers);
743 ty::provide(providers);
744 traits::provide(providers);
745 stability::provide(providers);
746 reachable::provide(providers);
747 rustc_passes::provide(providers);
748 rustc_traits::provide(providers);
749 middle::region::provide(providers);
750 cstore::provide(providers);
751 lint::provide(providers);
752 rustc_lint::provide(providers);
753 rustc_codegen_utils::provide(providers);
754 rustc_codegen_ssa::provide(providers);
757 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
758 cstore::provide_extern(providers);
759 rustc_codegen_ssa::provide_extern(providers);
762 declare_box_region_type!(
765 (&'tcx GlobalCtxt<'tcx>) -> ((), ())
768 impl BoxedGlobalCtxt {
769 pub fn enter<F, R>(&mut self, f: F) -> R
771 F: for<'tcx> FnOnce(TyCtxt<'tcx>) -> R,
773 self.access(|gcx| ty::tls::enter_global(gcx, |tcx| f(tcx)))
777 pub fn create_global_ctxt(
779 lint_store: Lrc<lint::LintStore>,
780 mut hir_forest: hir::map::Forest,
781 mut resolver_outputs: ResolverOutputs,
782 outputs: OutputFilenames,
784 ) -> BoxedGlobalCtxt {
785 let sess = compiler.session().clone();
786 let codegen_backend = compiler.codegen_backend().clone();
787 let crate_name = crate_name.to_string();
788 let defs = mem::take(&mut resolver_outputs.definitions);
790 let ((), result) = BoxedGlobalCtxt::new(static move || {
793 let global_ctxt: Option<GlobalCtxt<'_>>;
794 let arenas = AllArenas::new();
796 // Construct the HIR map.
797 let hir_map = time(sess, "indexing HIR", || {
798 hir::map::map_crate(sess, &*resolver_outputs.cstore, &mut hir_forest, &defs)
801 let query_result_on_disk_cache = time(sess, "load query result cache", || {
802 rustc_incremental::load_query_result_cache(sess)
805 let mut local_providers = ty::query::Providers::default();
806 default_provide(&mut local_providers);
807 codegen_backend.provide(&mut local_providers);
809 let mut extern_providers = local_providers;
810 default_provide_extern(&mut extern_providers);
811 codegen_backend.provide_extern(&mut extern_providers);
813 let gcx = TyCtxt::create_global_ctxt(
821 query_result_on_disk_cache,
826 global_ctxt = Some(gcx);
827 let gcx = global_ctxt.as_ref().unwrap();
829 ty::tls::enter_global(gcx, |tcx| {
830 // Do some initialization of the DepGraph that can only be done with the
832 time(tcx.sess, "dep graph tcx init", || rustc_incremental::dep_graph_tcx_init(tcx));
835 yield BoxedGlobalCtxt::initial_yield(());
836 box_region_allow_access!(for('tcx), (&'tcx GlobalCtxt<'tcx>), (gcx));
838 if sess.opts.debugging_opts.query_stats {
839 gcx.queries.print_stats();
846 /// Runs the resolution, type-checking, region checking and other
847 /// miscellaneous analysis passes on the crate.
848 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
849 assert_eq!(cnum, LOCAL_CRATE);
852 let mut entry_point = None;
854 time(sess, "misc checking 1", || {
856 entry_point = time(sess, "looking for entry point", || {
857 rustc_passes::entry::find_entry_point(tcx)
860 time(sess, "looking for plugin registrar", || {
861 plugin::build::find_plugin_registrar(tcx)
864 time(sess, "looking for derive registrar", || {
865 proc_macro_decls::find(tcx)
868 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
869 let local_def_id = tcx.hir().local_def_id(module);
870 tcx.ensure().check_mod_loops(local_def_id);
871 tcx.ensure().check_mod_attrs(local_def_id);
872 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
877 // passes are timed inside typeck
878 typeck::check_crate(tcx)?;
880 time(sess, "misc checking 2", || {
882 time(sess, "match checking", || {
883 tcx.par_body_owners(|def_id| {
884 tcx.ensure().check_match(def_id);
888 time(sess, "liveness checking + intrinsic checking", || {
889 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
890 // this must run before MIR dump, because
891 // "not all control paths return a value" is reported here.
893 // maybe move the check to a MIR pass?
894 let local_def_id = tcx.hir().local_def_id(module);
896 tcx.ensure().check_mod_liveness(local_def_id);
897 tcx.ensure().check_mod_intrinsics(local_def_id);
903 time(sess, "MIR borrow checking", || {
904 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
907 time(sess, "dumping Chalk-like clauses", || {
908 rustc_traits::lowering::dump_program_clauses(tcx);
911 time(sess, "MIR effect checking", || {
912 for def_id in tcx.body_owners() {
913 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
917 time(sess, "layout testing", || layout_test::test_layout(tcx));
919 // Avoid overwhelming user with errors if borrow checking failed.
920 // I'm not sure how helpful this is, to be honest, but it avoids a
921 // lot of annoying errors in the compile-fail tests (basically,
922 // lint warnings and so on -- kindck used to do this abort, but
923 // kindck is gone now). -nmatsakis
924 if sess.has_errors() {
925 return Err(ErrorReported);
928 time(sess, "misc checking 3", || {
930 time(sess, "privacy access levels", || {
931 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
934 time(sess, "private in public", || {
935 tcx.ensure().check_private_in_public(LOCAL_CRATE);
938 time(sess, "death checking", || rustc_passes::dead::check_crate(tcx));
940 time(sess, "unused lib feature checking", || {
941 stability::check_unused_or_stable_features(tcx)
944 time(sess, "lint checking", || {
945 lint::check_crate(tcx, || rustc_lint::BuiltinCombinedLateLintPass::new());
949 time(sess, "privacy checking modules", || {
950 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
951 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
960 fn encode_and_write_metadata(
962 outputs: &OutputFilenames,
963 ) -> (middle::cstore::EncodedMetadata, bool) {
964 #[derive(PartialEq, Eq, PartialOrd, Ord)]
971 let metadata_kind = tcx.sess.crate_types.borrow().iter().map(|ty| {
973 CrateType::Executable |
974 CrateType::Staticlib |
975 CrateType::Cdylib => MetadataKind::None,
977 CrateType::Rlib => MetadataKind::Uncompressed,
980 CrateType::ProcMacro => MetadataKind::Compressed,
982 }).max().unwrap_or(MetadataKind::None);
984 let metadata = match metadata_kind {
985 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
986 MetadataKind::Uncompressed |
987 MetadataKind::Compressed => tcx.encode_metadata(),
990 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
991 if need_metadata_file {
992 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
993 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
994 // To avoid races with another rustc process scanning the output directory,
995 // we need to write the file somewhere else and atomically move it to its
996 // final destination, with an `fs::rename` call. In order for the rename to
997 // always succeed, the temporary file needs to be on the same filesystem,
998 // which is why we create it inside the output directory specifically.
999 let metadata_tmpdir = TempFileBuilder::new()
1001 .tempdir_in(out_filename.parent().unwrap())
1002 .unwrap_or_else(|err| {
1003 tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err))
1005 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
1006 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
1007 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
1009 if tcx.sess.opts.json_artifact_notifications {
1010 tcx.sess.parse_sess.span_diagnostic
1011 .emit_artifact_notification(&out_filename, "metadata");
1015 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
1017 (metadata, need_metadata_module)
1020 /// Runs the codegen backend, after which the AST and analysis can
1022 pub fn start_codegen<'tcx>(
1023 codegen_backend: &dyn CodegenBackend,
1025 outputs: &OutputFilenames,
1027 if log_enabled!(::log::Level::Info) {
1028 println!("Pre-codegen");
1029 tcx.print_debug_stats();
1032 let (metadata, need_metadata_module) = time(tcx.sess, "metadata encoding and writing", || {
1033 encode_and_write_metadata(tcx, outputs)
1036 let codegen = time(tcx.sess, "codegen", move || {
1037 let _prof_timer = tcx.prof.generic_activity("codegen_crate");
1038 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
1041 if log_enabled!(::log::Level::Info) {
1042 println!("Post-codegen");
1043 tcx.print_debug_stats();
1046 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
1047 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
1048 tcx.sess.err(&format!("could not emit MIR: {}", e));
1049 tcx.sess.abort_if_errors();