1 use crate::interface::{Compiler, Result};
2 use crate::proc_macro_decls;
5 use log::{info, log_enabled, warn};
6 use rustc_ast::mut_visit::MutVisitor;
7 use rustc_ast::{self, ast, visit};
8 use rustc_codegen_ssa::back::link::emit_metadata;
9 use rustc_codegen_ssa::traits::CodegenBackend;
10 use rustc_data_structures::sync::{par_iter, Lrc, Once, ParallelIterator, WorkerLocal};
11 use rustc_data_structures::{box_region_allow_access, declare_box_region_type, parallel};
12 use rustc_errors::{ErrorReported, PResult};
13 use rustc_expand::base::ExtCtxt;
14 use rustc_hir::def_id::{CrateNum, LOCAL_CRATE};
15 use rustc_hir::definitions::Definitions;
17 use rustc_lint::LintStore;
18 use rustc_middle::arena::Arena;
19 use rustc_middle::dep_graph::DepGraph;
20 use rustc_middle::middle;
21 use rustc_middle::middle::cstore::{CrateStore, MetadataLoader, MetadataLoaderDyn};
22 use rustc_middle::ty::steal::Steal;
23 use rustc_middle::ty::{self, GlobalCtxt, ResolverOutputs, TyCtxt};
25 use rustc_mir_build as mir_build;
26 use rustc_parse::{parse_crate_from_file, parse_crate_from_source_str};
27 use rustc_passes::{self, hir_stats, layout_test};
28 use rustc_plugin_impl as plugin;
29 use rustc_resolve::{Resolver, ResolverArenas};
30 use rustc_session::config::{
31 self, CrateType, Input, OutputFilenames, OutputType, PpMode, PpSourceMode,
33 use rustc_session::lint;
34 use rustc_session::output::{filename_for_input, filename_for_metadata};
35 use rustc_session::search_paths::PathKind;
36 use rustc_session::Session;
37 use rustc_span::symbol::Symbol;
38 use rustc_span::FileName;
39 use rustc_trait_selection::traits;
40 use rustc_typeck as typeck;
42 use rustc_serialize::json;
43 use tempfile::Builder as TempFileBuilder;
46 use std::cell::RefCell;
47 use std::ffi::OsString;
48 use std::io::{self, BufWriter, Write};
49 use std::path::PathBuf;
51 use std::{env, fs, iter, mem};
53 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
54 let krate = sess.time("parse_crate", || match input {
55 Input::File(file) => parse_crate_from_file(file, &sess.parse_sess),
56 Input::Str { input, name } => {
57 parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess)
61 if sess.opts.debugging_opts.ast_json_noexpand {
62 println!("{}", json::as_json(&krate));
65 if sess.opts.debugging_opts.input_stats {
66 println!("Lines of code: {}", sess.source_map().count_lines());
67 println!("Pre-expansion node count: {}", count_nodes(&krate));
70 if let Some(ref s) = sess.opts.debugging_opts.show_span {
71 rustc_ast_passes::show_span::run(sess.diagnostic(), s, &krate);
74 if sess.opts.debugging_opts.hir_stats {
75 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
81 fn count_nodes(krate: &ast::Crate) -> usize {
82 let mut counter = rustc_ast_passes::node_count::NodeCounter::new();
83 visit::walk_crate(&mut counter, krate);
87 declare_box_region_type!(
90 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
93 /// Runs the "early phases" of the compiler: initial `cfg` processing, loading compiler plugins,
94 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
95 /// harness if one is to be provided, injection of a dependency on the
96 /// standard library and prelude, and name resolution.
98 /// Returns `None` if we're aborting after handling -W help.
99 pub fn configure_and_expand(
101 lint_store: Lrc<LintStore>,
102 metadata_loader: Box<MetadataLoaderDyn>,
105 ) -> Result<(ast::Crate, BoxedResolver)> {
106 // Currently, we ignore the name resolution data structures for the purposes of dependency
107 // tracking. Instead we will run name resolution and include its output in the hash of each
108 // item, much like we do for macro expansion. In other words, the hash reflects not just
109 // its contents but the results of name resolution on those contents. Hopefully we'll push
110 // this back at some point.
111 let crate_name = crate_name.to_string();
112 let (result, resolver) = BoxedResolver::new(static move |mut action| {
115 let resolver_arenas = Resolver::arenas();
116 let res = configure_and_expand_inner(
124 let mut resolver = match res {
126 yield BoxedResolver::initial_yield(Err(v));
129 Ok((krate, resolver)) => {
130 action = yield BoxedResolver::initial_yield(Ok(krate));
134 box_region_allow_access!(for(), (&mut Resolver<'_>), (&mut resolver), action);
135 resolver.into_outputs()
137 result.map(|k| (k, resolver))
141 pub fn to_resolver_outputs(resolver: Rc<RefCell<BoxedResolver>>) -> ResolverOutputs {
142 match Rc::try_unwrap(resolver) {
143 Ok(resolver) => resolver.into_inner().complete(),
144 Err(resolver) => resolver.borrow_mut().access(|resolver| resolver.clone_outputs()),
149 pub fn register_plugins<'a>(
151 metadata_loader: &'a dyn MetadataLoader,
152 register_lints: impl Fn(&Session, &mut LintStore),
153 mut krate: ast::Crate,
155 ) -> Result<(ast::Crate, Lrc<LintStore>)> {
156 krate = sess.time("attributes_injection", || {
157 rustc_builtin_macros::cmdline_attrs::inject(
160 &sess.opts.debugging_opts.crate_attr,
164 let (krate, features) = rustc_expand::config::features(
168 &sess.opts.debugging_opts.allow_features,
170 // these need to be set "early" so that expansion sees `quote` if enabled.
171 sess.init_features(features);
173 let crate_types = util::collect_crate_types(sess, &krate.attrs);
174 sess.crate_types.set(crate_types);
176 let disambiguator = util::compute_crate_disambiguator(sess);
177 sess.crate_disambiguator.set(disambiguator);
178 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
180 if sess.opts.incremental.is_some() {
181 sess.time("incr_comp_garbage_collect_session_directories", || {
182 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
184 "Error while trying to garbage collect incremental \
185 compilation cache directory: {}",
192 sess.time("recursion_limit", || {
193 middle::limits::update_limits(sess, &krate);
196 let mut lint_store = rustc_lint::new_lint_store(
197 sess.opts.debugging_opts.no_interleave_lints,
198 sess.unstable_options(),
200 register_lints(&sess, &mut lint_store);
203 sess.time("plugin_loading", || plugin::load::load_plugins(sess, metadata_loader, &krate));
204 sess.time("plugin_registration", || {
205 let mut registry = plugin::Registry { lint_store: &mut lint_store };
206 for registrar in registrars {
207 registrar(&mut registry);
211 Ok((krate, Lrc::new(lint_store)))
214 fn pre_expansion_lint(sess: &Session, lint_store: &LintStore, krate: &ast::Crate) {
215 sess.time("pre_AST_expansion_lint_checks", || {
216 rustc_lint::check_ast_crate(
222 rustc_lint::BuiltinCombinedPreExpansionLintPass::new(),
227 fn configure_and_expand_inner<'a>(
229 lint_store: &'a LintStore,
230 mut krate: ast::Crate,
232 resolver_arenas: &'a ResolverArenas<'a>,
233 metadata_loader: &'a MetadataLoaderDyn,
234 ) -> Result<(ast::Crate, Resolver<'a>)> {
235 pre_expansion_lint(sess, lint_store, &krate);
237 let mut resolver = Resolver::new(sess, &krate, crate_name, metadata_loader, &resolver_arenas);
238 rustc_builtin_macros::register_builtin_macros(&mut resolver, sess.edition());
240 krate = sess.time("crate_injection", || {
241 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
242 let (krate, name) = rustc_builtin_macros::standard_library_imports::inject(
248 if let Some(name) = name {
249 sess.parse_sess.injected_crate_name.set(name);
254 util::check_attr_crate_type(&krate.attrs, &mut resolver.lint_buffer());
257 krate = sess.time("macro_expand_crate", || {
258 // Windows dlls do not have rpaths, so they don't know how to find their
259 // dependencies. It's up to us to tell the system where to find all the
260 // dependent dlls. Note that this uses cfg!(windows) as opposed to
261 // targ_cfg because syntax extensions are always loaded for the host
262 // compiler, not for the target.
264 // This is somewhat of an inherently racy operation, however, as
265 // multiple threads calling this function could possibly continue
266 // extending PATH far beyond what it should. To solve this for now we
267 // just don't add any new elements to PATH which are already there
268 // within PATH. This is basically a targeted fix at #17360 for rustdoc
269 // which runs rustc in parallel but has been seen (#33844) to cause
270 // problems with PATH becoming too long.
271 let mut old_path = OsString::new();
273 old_path = env::var_os("PATH").unwrap_or(old_path);
274 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
275 for path in env::split_paths(&old_path) {
276 if !new_path.contains(&path) {
283 new_path.iter().filter(|p| env::join_paths(iter::once(p)).is_ok()),
289 // Create the config for macro expansion
290 let features = sess.features_untracked();
291 let cfg = rustc_expand::expand::ExpansionConfig {
292 features: Some(&features),
293 recursion_limit: *sess.recursion_limit.get(),
294 trace_mac: sess.opts.debugging_opts.trace_macros,
295 should_test: sess.opts.test,
296 ..rustc_expand::expand::ExpansionConfig::default(crate_name.to_string())
299 let extern_mod_loaded = |k: &ast::Crate| pre_expansion_lint(sess, lint_store, k);
300 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver, Some(&extern_mod_loaded));
302 // Expand macros now!
303 let krate = sess.time("expand_crate", || ecx.monotonic_expander().expand_crate(krate));
305 // The rest is error reporting
307 sess.time("check_unused_macros", || {
308 ecx.check_unused_macros();
311 let mut missing_fragment_specifiers: Vec<_> =
312 ecx.parse_sess.missing_fragment_specifiers.borrow().iter().cloned().collect();
313 missing_fragment_specifiers.sort();
315 let recursion_limit_hit = ecx.reduced_recursion_limit.is_some();
317 for span in missing_fragment_specifiers {
318 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
319 let msg = "missing fragment specifier";
320 resolver.lint_buffer().buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
323 env::set_var("PATH", &old_path);
326 if recursion_limit_hit {
327 // If we hit a recursion limit, exit early to avoid later passes getting overwhelmed
335 sess.time("maybe_building_test_harness", || {
336 rustc_builtin_macros::test_harness::inject(
342 &sess.features_untracked(),
343 sess.panic_strategy(),
344 sess.target.target.options.panic_strategy,
345 sess.opts.debugging_opts.panic_abort_tests,
349 // If we're actually rustdoc then there's no need to actually compile
350 // anything, so switch everything to just looping
351 let mut should_loop = sess.opts.actually_rustdoc;
352 if let Some(PpMode::PpmSource(PpSourceMode::PpmEveryBodyLoops)) = sess.opts.pretty {
356 util::ReplaceBodyWithLoop::new(&mut resolver).visit_crate(&mut krate);
359 let has_proc_macro_decls = sess.time("AST_validation", || {
360 rustc_ast_passes::ast_validation::check_crate(sess, &krate, &mut resolver.lint_buffer())
363 let crate_types = sess.crate_types.borrow();
364 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
366 // For backwards compatibility, we don't try to run proc macro injection
367 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
368 // specified. This should only affect users who manually invoke 'rustdoc', as
369 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
370 // However, we do emit a warning, to let such users know that they should
371 // start passing '--crate-type proc-macro'
372 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
373 let mut msg = sess.diagnostic().struct_warn(
374 &"Trying to document proc macro crate \
375 without passing '--crate-type proc-macro to rustdoc",
378 msg.warn("The generated documentation may be incorrect");
381 krate = sess.time("maybe_create_a_macro_crate", || {
382 let num_crate_types = crate_types.len();
383 let is_test_crate = sess.opts.test;
384 rustc_builtin_macros::proc_macro_harness::inject(
389 has_proc_macro_decls,
397 // Done with macro expansion!
399 if sess.opts.debugging_opts.input_stats {
400 println!("Post-expansion node count: {}", count_nodes(&krate));
403 if sess.opts.debugging_opts.hir_stats {
404 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
407 if sess.opts.debugging_opts.ast_json {
408 println!("{}", json::as_json(&krate));
411 resolver.resolve_crate(&krate);
413 // Needs to go *after* expansion to be able to check the results of macro expansion.
414 sess.time("complete_gated_feature_checking", || {
415 rustc_ast_passes::feature_gate::check_crate(
418 &sess.features_untracked(),
419 sess.opts.unstable_features,
423 // Add all buffered lints from the `ParseSess` to the `Session`.
424 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
425 info!("{} parse sess buffered_lints", buffered_lints.len());
426 for early_lint in buffered_lints.drain(..) {
427 resolver.lint_buffer().add_early_lint(early_lint);
431 Ok((krate, resolver))
434 pub fn lower_to_hir<'res, 'tcx>(
436 lint_store: &LintStore,
437 resolver: &'res mut Resolver<'_>,
438 dep_graph: &'res DepGraph,
439 krate: &'res ast::Crate,
440 arena: &'tcx rustc_ast_lowering::Arena<'tcx>,
442 // We're constructing the HIR here; we don't care what we will
443 // read, since we haven't even constructed the *input* to
445 dep_graph.assert_ignored();
448 let hir_crate = rustc_ast_lowering::lower_crate(
452 rustc_parse::nt_to_tokenstream,
456 if sess.opts.debugging_opts.hir_stats {
457 hir_stats::print_hir_stats(&hir_crate);
460 sess.time("early_lint_checks", || {
461 rustc_lint::check_ast_crate(
466 Some(std::mem::take(resolver.lint_buffer())),
467 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
471 // Discard hygiene data, which isn't required after lowering to HIR.
472 if !sess.opts.debugging_opts.keep_hygiene_data {
473 rustc_span::hygiene::clear_syntax_context_map();
479 // Returns all the paths that correspond to generated files.
480 fn generated_output_paths(
482 outputs: &OutputFilenames,
486 let mut out_filenames = Vec::new();
487 for output_type in sess.opts.output_types.keys() {
488 let file = outputs.path(*output_type);
490 // If the filename has been overridden using `-o`, it will not be modified
491 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
492 OutputType::Exe if !exact_name => {
493 for crate_type in sess.crate_types.borrow().iter() {
494 let p = filename_for_input(sess, *crate_type, crate_name, outputs);
495 out_filenames.push(p);
498 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
499 // Don't add the dep-info output when omitting it from dep-info targets
502 out_filenames.push(file);
509 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
510 // returns None for every file path.
511 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
513 F: Fn(&PathBuf) -> Option<T>,
515 for output_path in output_paths {
516 if let Some(result) = f(output_path) {
523 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
524 let input_path = input_path.canonicalize().ok();
525 if input_path.is_none() {
528 let check = |output_path: &PathBuf| {
529 if output_path.canonicalize().ok() == input_path { Some(()) } else { None }
531 check_output(output_paths, check).is_some()
534 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
535 let check = |output_path: &PathBuf| output_path.is_dir().then(|| output_path.clone());
536 check_output(output_paths, check)
539 fn escape_dep_filename(filename: &FileName) -> String {
540 // Apparently clang and gcc *only* escape spaces:
541 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
542 filename.to_string().replace(" ", "\\ ")
547 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
548 outputs: &OutputFilenames,
549 out_filenames: &[PathBuf],
551 // Write out dependency rules to the dep-info file if requested
552 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
555 let deps_filename = outputs.path(OutputType::DepInfo);
557 let result = (|| -> io::Result<()> {
558 // Build a list of files used to compile the output and
559 // write Makefile-compatible dependency rules
560 let mut files: Vec<String> = sess
564 .filter(|fmap| fmap.is_real_file())
565 .filter(|fmap| !fmap.is_imported())
566 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
569 if sess.binary_dep_depinfo() {
570 boxed_resolver.borrow().borrow_mut().access(|resolver| {
571 for cnum in resolver.cstore().crates_untracked() {
572 let source = resolver.cstore().crate_source_untracked(cnum);
573 if let Some((path, _)) = source.dylib {
574 files.push(escape_dep_filename(&FileName::Real(path)));
576 if let Some((path, _)) = source.rlib {
577 files.push(escape_dep_filename(&FileName::Real(path)));
579 if let Some((path, _)) = source.rmeta {
580 files.push(escape_dep_filename(&FileName::Real(path)));
586 let mut file = BufWriter::new(fs::File::create(&deps_filename)?);
587 for path in out_filenames {
588 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
591 // Emit a fake target for each input file to the compilation. This
592 // prevents `make` from spitting out an error if a file is later
593 // deleted. For more info see #28735
595 writeln!(file, "{}:", path)?;
602 if sess.opts.json_artifact_notifications {
605 .emit_artifact_notification(&deps_filename, "dep-info");
608 Err(e) => sess.fatal(&format!(
609 "error writing dependencies to `{}`: {}",
610 deps_filename.display(),
616 pub fn prepare_outputs(
620 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
622 ) -> Result<OutputFilenames> {
623 let _timer = sess.timer("prepare_outputs");
625 // FIXME: rustdoc passes &[] instead of &krate.attrs here
626 let outputs = util::build_output_filenames(
628 &compiler.output_dir,
629 &compiler.output_file,
635 generated_output_paths(sess, &outputs, compiler.output_file.is_some(), &crate_name);
637 // Ensure the source file isn't accidentally overwritten during compilation.
638 if let Some(ref input_path) = compiler.input_path {
639 if sess.opts.will_create_output_file() {
640 if output_contains_path(&output_paths, input_path) {
642 "the input file \"{}\" would be overwritten by the generated \
646 return Err(ErrorReported);
648 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
650 "the generated executable for the input file \"{}\" conflicts with the \
651 existing directory \"{}\"",
652 input_path.display(),
655 return Err(ErrorReported);
660 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
662 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
663 && sess.opts.output_types.len() == 1;
666 if let Some(ref dir) = compiler.output_dir {
667 if fs::create_dir_all(dir).is_err() {
668 sess.err("failed to find or create the directory specified by `--out-dir`");
669 return Err(ErrorReported);
677 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
678 providers.analysis = analysis;
679 proc_macro_decls::provide(providers);
680 plugin::build::provide(providers);
681 rustc_middle::hir::provide(providers);
682 mir::provide(providers);
683 mir_build::provide(providers);
684 rustc_privacy::provide(providers);
685 typeck::provide(providers);
686 ty::provide(providers);
687 traits::provide(providers);
688 rustc_passes::provide(providers);
689 rustc_resolve::provide(providers);
690 rustc_traits::provide(providers);
691 rustc_ty::provide(providers);
692 rustc_metadata::provide(providers);
693 rustc_lint::provide(providers);
694 rustc_symbol_mangling::provide(providers);
695 rustc_codegen_ssa::provide(providers);
698 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
699 rustc_metadata::provide_extern(providers);
700 rustc_codegen_ssa::provide_extern(providers);
703 pub struct QueryContext<'tcx>(&'tcx GlobalCtxt<'tcx>);
705 impl<'tcx> QueryContext<'tcx> {
706 pub fn enter<F, R>(&mut self, f: F) -> R
708 F: FnOnce(TyCtxt<'tcx>) -> R,
710 ty::tls::enter_global(self.0, f)
713 pub fn print_stats(&mut self) {
714 self.enter(ty::query::print_stats)
718 pub fn create_global_ctxt<'tcx>(
719 compiler: &'tcx Compiler,
720 lint_store: Lrc<LintStore>,
721 krate: &'tcx Crate<'tcx>,
723 mut resolver_outputs: ResolverOutputs,
724 outputs: OutputFilenames,
726 global_ctxt: &'tcx Once<GlobalCtxt<'tcx>>,
727 arena: &'tcx WorkerLocal<Arena<'tcx>>,
728 ) -> QueryContext<'tcx> {
729 let sess = &compiler.session();
730 let defs: &'tcx Definitions = arena.alloc(mem::take(&mut resolver_outputs.definitions));
732 let query_result_on_disk_cache = rustc_incremental::load_query_result_cache(sess);
734 let codegen_backend = compiler.codegen_backend();
735 let mut local_providers = ty::query::Providers::default();
736 default_provide(&mut local_providers);
737 codegen_backend.provide(&mut local_providers);
739 let mut extern_providers = local_providers;
740 default_provide_extern(&mut extern_providers);
741 codegen_backend.provide_extern(&mut extern_providers);
743 if let Some(callback) = compiler.override_queries {
744 callback(sess, &mut local_providers, &mut extern_providers);
747 let gcx = sess.time("setup_global_ctxt", || {
748 global_ctxt.init_locking(|| {
749 TyCtxt::create_global_ctxt(
759 query_result_on_disk_cache,
766 // Do some initialization of the DepGraph that can only be done with the tcx available.
767 ty::tls::enter_global(&gcx, |tcx| {
768 tcx.sess.time("dep_graph_tcx_init", || rustc_incremental::dep_graph_tcx_init(tcx));
774 /// Runs the resolution, type-checking, region checking and other
775 /// miscellaneous analysis passes on the crate.
776 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
777 assert_eq!(cnum, LOCAL_CRATE);
779 rustc_passes::hir_id_validator::check_crate(tcx);
782 let mut entry_point = None;
784 sess.time("misc_checking_1", || {
788 .time("looking_for_entry_point", || rustc_passes::entry::find_entry_point(tcx));
790 sess.time("looking_for_plugin_registrar", || {
791 plugin::build::find_plugin_registrar(tcx)
794 sess.time("looking_for_derive_registrar", || proc_macro_decls::find(tcx));
797 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
798 let local_def_id = tcx.hir().local_def_id(module);
799 tcx.ensure().check_mod_loops(local_def_id);
800 tcx.ensure().check_mod_attrs(local_def_id);
801 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
802 tcx.ensure().check_mod_const_bodies(local_def_id);
808 // passes are timed inside typeck
809 typeck::check_crate(tcx)?;
811 sess.time("misc_checking_2", || {
814 sess.time("match_checking", || {
815 tcx.par_body_owners(|def_id| {
816 tcx.ensure().check_match(def_id.to_def_id());
821 sess.time("liveness_and_intrinsic_checking", || {
822 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
823 // this must run before MIR dump, because
824 // "not all control paths return a value" is reported here.
826 // maybe move the check to a MIR pass?
827 let local_def_id = tcx.hir().local_def_id(module);
829 tcx.ensure().check_mod_liveness(local_def_id);
830 tcx.ensure().check_mod_intrinsics(local_def_id);
837 sess.time("MIR_borrow_checking", || {
838 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
841 sess.time("MIR_effect_checking", || {
842 for def_id in tcx.body_owners() {
843 mir::transform::check_unsafety::check_unsafety(tcx, def_id.to_def_id())
847 sess.time("layout_testing", || layout_test::test_layout(tcx));
849 // Avoid overwhelming user with errors if borrow checking failed.
850 // I'm not sure how helpful this is, to be honest, but it avoids a
851 // lot of annoying errors in the compile-fail tests (basically,
852 // lint warnings and so on -- kindck used to do this abort, but
853 // kindck is gone now). -nmatsakis
854 if sess.has_errors() {
855 return Err(ErrorReported);
858 sess.time("misc_checking_3", || {
861 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
865 tcx.ensure().check_private_in_public(LOCAL_CRATE);
868 sess.time("death_checking", || rustc_passes::dead::check_crate(tcx));
871 sess.time("unused_lib_feature_checking", || {
872 rustc_passes::stability::check_unused_or_stable_features(tcx)
876 sess.time("lint_checking", || {
877 rustc_lint::check_crate(tcx, || {
878 rustc_lint::BuiltinCombinedLateLintPass::new()
885 sess.time("privacy_checking_modules", || {
886 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
887 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
897 fn encode_and_write_metadata(
899 outputs: &OutputFilenames,
900 ) -> (middle::cstore::EncodedMetadata, bool) {
901 #[derive(PartialEq, Eq, PartialOrd, Ord)]
908 let metadata_kind = tcx
913 .map(|ty| match *ty {
914 CrateType::Executable | CrateType::Staticlib | CrateType::Cdylib => MetadataKind::None,
916 CrateType::Rlib => MetadataKind::Uncompressed,
918 CrateType::Dylib | CrateType::ProcMacro => MetadataKind::Compressed,
921 .unwrap_or(MetadataKind::None);
923 let metadata = match metadata_kind {
924 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
925 MetadataKind::Uncompressed | MetadataKind::Compressed => tcx.encode_metadata(),
928 let _prof_timer = tcx.sess.prof.generic_activity("write_crate_metadata");
930 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
931 if need_metadata_file {
932 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
933 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
934 // To avoid races with another rustc process scanning the output directory,
935 // we need to write the file somewhere else and atomically move it to its
936 // final destination, with an `fs::rename` call. In order for the rename to
937 // always succeed, the temporary file needs to be on the same filesystem,
938 // which is why we create it inside the output directory specifically.
939 let metadata_tmpdir = TempFileBuilder::new()
941 .tempdir_in(out_filename.parent().unwrap())
942 .unwrap_or_else(|err| tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err)));
943 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
944 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
945 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
947 if tcx.sess.opts.json_artifact_notifications {
951 .emit_artifact_notification(&out_filename, "metadata");
955 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
957 (metadata, need_metadata_module)
960 /// Runs the codegen backend, after which the AST and analysis can
962 pub fn start_codegen<'tcx>(
963 codegen_backend: &dyn CodegenBackend,
965 outputs: &OutputFilenames,
967 if log_enabled!(::log::Level::Info) {
968 println!("Pre-codegen");
969 tcx.print_debug_stats();
972 let (metadata, need_metadata_module) = encode_and_write_metadata(tcx, outputs);
974 let codegen = tcx.sess.time("codegen_crate", move || {
975 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
978 if log_enabled!(::log::Level::Info) {
979 println!("Post-codegen");
980 tcx.print_debug_stats();
983 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
984 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
985 tcx.sess.err(&format!("could not emit MIR: {}", e));
986 tcx.sess.abort_if_errors();