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_incremental;
26 use rustc_metadata::cstore;
28 use rustc_passes::{self, ast_validation, hir_stats, layout_test};
29 use rustc_plugin as plugin;
30 use rustc_plugin::registry::Registry;
32 use rustc_resolve::{Resolver, ResolverArenas};
34 use rustc_typeck as typeck;
35 use syntax::{self, ast, visit};
36 use syntax::early_buffered_lints::BufferedEarlyLint;
37 use syntax_expand::base::{NamedSyntaxExtension, ExtCtxt};
38 use syntax::mut_visit::MutVisitor;
39 use syntax::parse::{self, PResult};
40 use syntax::util::node_count::NodeCounter;
41 use syntax::symbol::Symbol;
42 use syntax_pos::FileName;
45 use rustc_serialize::json;
46 use tempfile::Builder as TempFileBuilder;
48 use std::{env, fs, iter, mem};
50 use std::ffi::OsString;
51 use std::io::{self, Write};
52 use std::path::PathBuf;
53 use std::cell::RefCell;
56 pub fn parse<'a>(sess: &'a Session, input: &Input) -> PResult<'a, ast::Crate> {
58 .set_continue_after_error(sess.opts.debugging_opts.continue_parse_after_error);
59 let krate = time(sess, "parsing", || {
60 let _prof_timer = sess.prof.generic_activity("parse_crate");
63 Input::File(ref file) => parse::parse_crate_from_file(file, &sess.parse_sess),
67 } => parse::parse_crate_from_source_str(name.clone(), input.clone(), &sess.parse_sess),
71 sess.diagnostic().set_continue_after_error(true);
73 if sess.opts.debugging_opts.ast_json_noexpand {
74 println!("{}", json::as_json(&krate));
77 if sess.opts.debugging_opts.input_stats {
80 sess.source_map().count_lines()
82 println!("Pre-expansion node count: {}", count_nodes(&krate));
85 if let Some(ref s) = sess.opts.debugging_opts.show_span {
86 syntax::show_span::run(sess.diagnostic(), s, &krate);
89 if sess.opts.debugging_opts.hir_stats {
90 hir_stats::print_ast_stats(&krate, "PRE EXPANSION AST STATS");
96 fn count_nodes(krate: &ast::Crate) -> usize {
97 let mut counter = NodeCounter::new();
98 visit::walk_crate(&mut counter, krate);
102 declare_box_region_type!(
105 (&mut Resolver<'_>) -> (Result<ast::Crate>, ResolverOutputs)
108 /// Runs the "early phases" of the compiler: initial `cfg` processing,
109 /// loading compiler plugins (including those from `addl_plugins`),
110 /// syntax expansion, secondary `cfg` expansion, synthesis of a test
111 /// harness if one is to be provided, injection of a dependency on the
112 /// standard library and prelude, and name resolution.
114 /// Returns `None` if we're aborting after handling -W help.
115 pub fn configure_and_expand(
117 lint_store: Lrc<lint::LintStore>,
118 metadata_loader: Box<MetadataLoaderDyn>,
121 plugin_info: PluginInfo,
122 ) -> Result<(ast::Crate, BoxedResolver)> {
123 // Currently, we ignore the name resolution data structures for the purposes of dependency
124 // tracking. Instead we will run name resolution and include its output in the hash of each
125 // item, much like we do for macro expansion. In other words, the hash reflects not just
126 // its contents but the results of name resolution on those contents. Hopefully we'll push
127 // this back at some point.
128 let crate_name = crate_name.to_string();
129 let (result, resolver) = BoxedResolver::new(static move || {
131 let resolver_arenas = Resolver::arenas();
132 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 struct PluginInfo {
167 syntax_exts: Vec<NamedSyntaxExtension>,
170 pub fn register_plugins<'a>(
172 metadata_loader: &'a dyn MetadataLoader,
173 register_lints: impl Fn(&Session, &mut lint::LintStore),
174 mut krate: ast::Crate,
176 ) -> Result<(ast::Crate, PluginInfo, Lrc<lint::LintStore>)> {
177 krate = time(sess, "attributes injection", || {
178 syntax_ext::cmdline_attrs::inject(
179 krate, &sess.parse_sess, &sess.opts.debugging_opts.crate_attr
183 let (krate, features) = syntax::config::features(
187 &sess.opts.debugging_opts.allow_features,
189 // these need to be set "early" so that expansion sees `quote` if enabled.
190 sess.init_features(features);
192 let crate_types = util::collect_crate_types(sess, &krate.attrs);
193 sess.crate_types.set(crate_types);
195 let disambiguator = util::compute_crate_disambiguator(sess);
196 sess.crate_disambiguator.set(disambiguator);
197 rustc_incremental::prepare_session_directory(sess, &crate_name, disambiguator);
199 if sess.opts.incremental.is_some() {
200 time(sess, "garbage-collect incremental cache directory", || {
202 sess.prof.generic_activity("incr_comp_garbage_collect_session_directories");
203 if let Err(e) = rustc_incremental::garbage_collect_session_directories(sess) {
205 "Error while trying to garbage collect incremental \
206 compilation cache directory: {}",
213 time(sess, "recursion limit", || {
214 middle::recursion_limit::update_limits(sess, &krate);
217 let registrars = time(sess, "plugin loading", || {
218 plugin::load::load_plugins(
222 Some(sess.opts.debugging_opts.extra_plugins.clone()),
226 let mut lint_store = rustc_lint::new_lint_store(
227 sess.opts.debugging_opts.no_interleave_lints,
228 sess.unstable_options(),
231 (register_lints)(&sess, &mut lint_store);
233 let mut registry = Registry::new(sess, &mut lint_store, krate.span);
235 time(sess, "plugin registration", || {
236 for registrar in registrars {
237 registry.args_hidden = Some(registrar.args);
238 (registrar.fun)(&mut registry);
249 *sess.plugin_llvm_passes.borrow_mut() = llvm_passes;
250 *sess.plugin_attributes.borrow_mut() = attributes;
252 Ok((krate, PluginInfo { syntax_exts }, Lrc::new(lint_store)))
255 fn configure_and_expand_inner<'a>(
257 lint_store: &'a lint::LintStore,
258 mut krate: ast::Crate,
260 resolver_arenas: &'a ResolverArenas<'a>,
261 metadata_loader: &'a MetadataLoaderDyn,
262 plugin_info: PluginInfo,
263 ) -> Result<(ast::Crate, Resolver<'a>)> {
264 time(sess, "pre-AST-expansion lint checks", || {
265 lint::check_ast_crate(
270 rustc_lint::BuiltinCombinedPreExpansionLintPass::new());
273 let mut resolver = Resolver::new(
280 syntax_ext::register_builtin_macros(&mut resolver, sess.edition());
282 krate = time(sess, "crate injection", || {
283 let alt_std_name = sess.opts.alt_std_name.as_ref().map(|s| Symbol::intern(s));
284 let (krate, name) = syntax_ext::standard_library_imports::inject(
290 if let Some(name) = name {
291 sess.parse_sess.injected_crate_name.set(name);
296 syntax_ext::plugin_macro_defs::inject(
297 &mut krate, &mut resolver, plugin_info.syntax_exts, sess.edition()
301 krate = time(sess, "expansion", || {
302 let _prof_timer = sess.prof.generic_activity("macro_expand_crate");
303 // Windows dlls do not have rpaths, so they don't know how to find their
304 // dependencies. It's up to us to tell the system where to find all the
305 // dependent dlls. Note that this uses cfg!(windows) as opposed to
306 // targ_cfg because syntax extensions are always loaded for the host
307 // compiler, not for the target.
309 // This is somewhat of an inherently racy operation, however, as
310 // multiple threads calling this function could possibly continue
311 // extending PATH far beyond what it should. To solve this for now we
312 // just don't add any new elements to PATH which are already there
313 // within PATH. This is basically a targeted fix at #17360 for rustdoc
314 // which runs rustc in parallel but has been seen (#33844) to cause
315 // problems with PATH becoming too long.
316 let mut old_path = OsString::new();
318 old_path = env::var_os("PATH").unwrap_or(old_path);
319 let mut new_path = sess.host_filesearch(PathKind::All).search_path_dirs();
320 for path in env::split_paths(&old_path) {
321 if !new_path.contains(&path) {
330 .filter(|p| env::join_paths(iter::once(p)).is_ok()),
335 // Create the config for macro expansion
336 let features = sess.features_untracked();
337 let cfg = syntax_expand::expand::ExpansionConfig {
338 features: Some(&features),
339 recursion_limit: *sess.recursion_limit.get(),
340 trace_mac: sess.opts.debugging_opts.trace_macros,
341 should_test: sess.opts.test,
342 ..syntax_expand::expand::ExpansionConfig::default(crate_name.to_string())
345 let mut ecx = ExtCtxt::new(&sess.parse_sess, cfg, &mut resolver);
347 // Expand macros now!
348 let krate = time(sess, "expand crate", || {
349 ecx.monotonic_expander().expand_crate(krate)
352 // The rest is error reporting
354 time(sess, "check unused macros", || {
355 ecx.check_unused_macros();
358 let mut missing_fragment_specifiers: Vec<_> = ecx.parse_sess
359 .missing_fragment_specifiers
364 missing_fragment_specifiers.sort();
366 for span in missing_fragment_specifiers {
367 let lint = lint::builtin::MISSING_FRAGMENT_SPECIFIER;
368 let msg = "missing fragment specifier";
369 sess.buffer_lint(lint, ast::CRATE_NODE_ID, span, msg);
372 env::set_var("PATH", &old_path);
377 time(sess, "maybe building test harness", || {
378 syntax_ext::test_harness::inject(
384 &sess.features_untracked(),
385 sess.panic_strategy(),
386 sess.target.target.options.panic_strategy,
387 sess.opts.debugging_opts.panic_abort_tests,
391 // If we're actually rustdoc then there's no need to actually compile
392 // anything, so switch everything to just looping
393 if sess.opts.actually_rustdoc {
394 util::ReplaceBodyWithLoop::new(sess).visit_crate(&mut krate);
397 let has_proc_macro_decls = time(sess, "AST validation", || {
398 ast_validation::check_crate(sess, &krate)
402 let crate_types = sess.crate_types.borrow();
403 let is_proc_macro_crate = crate_types.contains(&config::CrateType::ProcMacro);
405 // For backwards compatibility, we don't try to run proc macro injection
406 // if rustdoc is run on a proc macro crate without '--crate-type proc-macro' being
407 // specified. This should only affect users who manually invoke 'rustdoc', as
408 // 'cargo doc' will automatically pass the proper '--crate-type' flags.
409 // However, we do emit a warning, to let such users know that they should
410 // start passing '--crate-type proc-macro'
411 if has_proc_macro_decls && sess.opts.actually_rustdoc && !is_proc_macro_crate {
412 let mut msg = sess.diagnostic().struct_warn(&"Trying to document proc macro crate \
413 without passing '--crate-type proc-macro to rustdoc");
415 msg.warn("The generated documentation may be incorrect");
418 krate = time(sess, "maybe creating a macro crate", || {
419 let num_crate_types = crate_types.len();
420 let is_test_crate = sess.opts.test;
421 syntax_ext::proc_macro_harness::inject(
426 has_proc_macro_decls,
434 // Done with macro expansion!
436 if sess.opts.debugging_opts.input_stats {
437 println!("Post-expansion node count: {}", count_nodes(&krate));
440 if sess.opts.debugging_opts.hir_stats {
441 hir_stats::print_ast_stats(&krate, "POST EXPANSION AST STATS");
444 if sess.opts.debugging_opts.ast_json {
445 println!("{}", json::as_json(&krate));
448 time(sess, "name resolution", || {
449 resolver.resolve_crate(&krate);
452 // Needs to go *after* expansion to be able to check the results of macro expansion.
453 time(sess, "complete gated feature checking", || {
454 syntax::feature_gate::check_crate(
457 &sess.features_untracked(),
458 sess.opts.unstable_features,
462 // Add all buffered lints from the `ParseSess` to the `Session`.
463 sess.parse_sess.buffered_lints.with_lock(|buffered_lints| {
464 info!("{} parse sess buffered_lints", buffered_lints.len());
465 for BufferedEarlyLint{id, span, msg, lint_id} in buffered_lints.drain(..) {
466 let lint = lint::Lint::from_parser_lint_id(lint_id);
467 sess.buffer_lint(lint, id, span, &msg);
471 Ok((krate, resolver))
476 lint_store: &lint::LintStore,
477 resolver: &mut Resolver<'_>,
478 dep_graph: &DepGraph,
480 ) -> Result<hir::map::Forest> {
482 let hir_forest = time(sess, "lowering AST -> HIR", || {
483 let nt_to_tokenstream = syntax::parse::nt_to_tokenstream;
484 let hir_crate = lower_crate(sess, &dep_graph, &krate, resolver, nt_to_tokenstream);
486 if sess.opts.debugging_opts.hir_stats {
487 hir_stats::print_hir_stats(&hir_crate);
490 hir::map::Forest::new(hir_crate, &dep_graph)
493 time(sess, "early lint checks", || {
494 lint::check_ast_crate(
499 rustc_lint::BuiltinCombinedEarlyLintPass::new(),
503 // Discard hygiene data, which isn't required after lowering to HIR.
504 if !sess.opts.debugging_opts.keep_hygiene_data {
505 syntax_pos::hygiene::clear_syntax_context_map();
511 // Returns all the paths that correspond to generated files.
512 fn generated_output_paths(
514 outputs: &OutputFilenames,
518 let mut out_filenames = Vec::new();
519 for output_type in sess.opts.output_types.keys() {
520 let file = outputs.path(*output_type);
522 // If the filename has been overridden using `-o`, it will not be modified
523 // by appending `.rlib`, `.exe`, etc., so we can skip this transformation.
524 OutputType::Exe if !exact_name => for crate_type in sess.crate_types.borrow().iter() {
525 let p = ::rustc_codegen_utils::link::filename_for_input(
531 out_filenames.push(p);
533 OutputType::DepInfo if sess.opts.debugging_opts.dep_info_omit_d_target => {
534 // Don't add the dep-info output when omitting it from dep-info targets
537 out_filenames.push(file);
544 // Runs `f` on every output file path and returns the first non-None result, or None if `f`
545 // returns None for every file path.
546 fn check_output<F, T>(output_paths: &[PathBuf], f: F) -> Option<T>
548 F: Fn(&PathBuf) -> Option<T>,
550 for output_path in output_paths {
551 if let Some(result) = f(output_path) {
558 fn output_contains_path(output_paths: &[PathBuf], input_path: &PathBuf) -> bool {
559 let input_path = input_path.canonicalize().ok();
560 if input_path.is_none() {
563 let check = |output_path: &PathBuf| {
564 if output_path.canonicalize().ok() == input_path {
570 check_output(output_paths, check).is_some()
573 fn output_conflicts_with_dir(output_paths: &[PathBuf]) -> Option<PathBuf> {
574 let check = |output_path: &PathBuf| {
575 if output_path.is_dir() {
576 Some(output_path.clone())
581 check_output(output_paths, check)
584 fn escape_dep_filename(filename: &FileName) -> String {
585 // Apparently clang and gcc *only* escape spaces:
586 // http://llvm.org/klaus/clang/commit/9d50634cfc268ecc9a7250226dd5ca0e945240d4
587 filename.to_string().replace(" ", "\\ ")
592 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
593 outputs: &OutputFilenames,
594 out_filenames: &[PathBuf],
596 // Write out dependency rules to the dep-info file if requested
597 if !sess.opts.output_types.contains_key(&OutputType::DepInfo) {
600 let deps_filename = outputs.path(OutputType::DepInfo);
602 let result = (|| -> io::Result<()> {
603 // Build a list of files used to compile the output and
604 // write Makefile-compatible dependency rules
605 let mut files: Vec<String> = sess.source_map()
608 .filter(|fmap| fmap.is_real_file())
609 .filter(|fmap| !fmap.is_imported())
610 .map(|fmap| escape_dep_filename(&fmap.unmapped_path.as_ref().unwrap_or(&fmap.name)))
613 if sess.binary_dep_depinfo() {
614 boxed_resolver.borrow().borrow_mut().access(|resolver| {
615 for cnum in resolver.cstore().crates_untracked() {
616 let source = resolver.cstore().crate_source_untracked(cnum);
617 if let Some((path, _)) = source.dylib {
618 files.push(escape_dep_filename(&FileName::Real(path)));
620 if let Some((path, _)) = source.rlib {
621 files.push(escape_dep_filename(&FileName::Real(path)));
623 if let Some((path, _)) = source.rmeta {
624 files.push(escape_dep_filename(&FileName::Real(path)));
630 let mut file = fs::File::create(&deps_filename)?;
631 for path in out_filenames {
632 writeln!(file, "{}: {}\n", path.display(), files.join(" "))?;
635 // Emit a fake target for each input file to the compilation. This
636 // prevents `make` from spitting out an error if a file is later
637 // deleted. For more info see #28735
639 writeln!(file, "{}:", path)?;
646 if sess.opts.json_artifact_notifications {
647 sess.parse_sess.span_diagnostic
648 .emit_artifact_notification(&deps_filename, "dep-info");
653 "error writing dependencies to `{}`: {}",
654 deps_filename.display(),
661 pub fn prepare_outputs(
665 boxed_resolver: &Steal<Rc<RefCell<BoxedResolver>>>,
667 ) -> Result<OutputFilenames> {
668 // FIXME: rustdoc passes &[] instead of &krate.attrs here
669 let outputs = util::build_output_filenames(
671 &compiler.output_dir,
672 &compiler.output_file,
677 let output_paths = generated_output_paths(
680 compiler.output_file.is_some(),
684 // Ensure the source file isn't accidentally overwritten during compilation.
685 if let Some(ref input_path) = compiler.input_path {
686 if sess.opts.will_create_output_file() {
687 if output_contains_path(&output_paths, input_path) {
689 "the input file \"{}\" would be overwritten by the generated \
693 return Err(ErrorReported);
695 if let Some(dir_path) = output_conflicts_with_dir(&output_paths) {
697 "the generated executable for the input file \"{}\" conflicts with the \
698 existing directory \"{}\"",
699 input_path.display(),
702 return Err(ErrorReported);
707 write_out_deps(sess, boxed_resolver, &outputs, &output_paths);
709 let only_dep_info = sess.opts.output_types.contains_key(&OutputType::DepInfo)
710 && sess.opts.output_types.len() == 1;
713 if let Some(ref dir) = compiler.output_dir {
714 if fs::create_dir_all(dir).is_err() {
715 sess.err("failed to find or create the directory specified by `--out-dir`");
716 return Err(ErrorReported);
724 pub fn default_provide(providers: &mut ty::query::Providers<'_>) {
725 providers.analysis = analysis;
726 proc_macro_decls::provide(providers);
727 plugin::build::provide(providers);
728 hir::provide(providers);
729 mir::provide(providers);
730 reachable::provide(providers);
731 resolve_lifetime::provide(providers);
732 rustc_privacy::provide(providers);
733 typeck::provide(providers);
734 ty::provide(providers);
735 traits::provide(providers);
736 stability::provide(providers);
737 reachable::provide(providers);
738 rustc_passes::provide(providers);
739 rustc_traits::provide(providers);
740 middle::region::provide(providers);
741 cstore::provide(providers);
742 lint::provide(providers);
743 rustc_lint::provide(providers);
744 rustc_codegen_utils::provide(providers);
745 rustc_codegen_ssa::provide(providers);
748 pub fn default_provide_extern(providers: &mut ty::query::Providers<'_>) {
749 cstore::provide_extern(providers);
750 rustc_codegen_ssa::provide_extern(providers);
753 declare_box_region_type!(
756 (&'tcx GlobalCtxt<'tcx>) -> ((), ())
759 impl BoxedGlobalCtxt {
760 pub fn enter<F, R>(&mut self, f: F) -> R
762 F: for<'tcx> FnOnce(TyCtxt<'tcx>) -> R,
764 self.access(|gcx| ty::tls::enter_global(gcx, |tcx| f(tcx)))
768 pub fn create_global_ctxt(
770 lint_store: Lrc<lint::LintStore>,
771 mut hir_forest: hir::map::Forest,
772 mut resolver_outputs: ResolverOutputs,
773 outputs: OutputFilenames,
775 ) -> BoxedGlobalCtxt {
776 let sess = compiler.session().clone();
777 let codegen_backend = compiler.codegen_backend().clone();
778 let crate_name = crate_name.to_string();
779 let defs = mem::take(&mut resolver_outputs.definitions);
781 let ((), result) = BoxedGlobalCtxt::new(static move || {
784 let global_ctxt: Option<GlobalCtxt<'_>>;
785 let arenas = AllArenas::new();
787 // Construct the HIR map.
788 let hir_map = time(sess, "indexing HIR", || {
789 hir::map::map_crate(sess, &*resolver_outputs.cstore, &mut hir_forest, &defs)
792 let query_result_on_disk_cache = time(sess, "load query result cache", || {
793 rustc_incremental::load_query_result_cache(sess)
796 let mut local_providers = ty::query::Providers::default();
797 default_provide(&mut local_providers);
798 codegen_backend.provide(&mut local_providers);
800 let mut extern_providers = local_providers;
801 default_provide_extern(&mut extern_providers);
802 codegen_backend.provide_extern(&mut extern_providers);
804 let gcx = TyCtxt::create_global_ctxt(
812 query_result_on_disk_cache,
817 global_ctxt = Some(gcx);
818 let gcx = global_ctxt.as_ref().unwrap();
820 ty::tls::enter_global(gcx, |tcx| {
821 // Do some initialization of the DepGraph that can only be done with the
823 time(tcx.sess, "dep graph tcx init", || rustc_incremental::dep_graph_tcx_init(tcx));
826 yield BoxedGlobalCtxt::initial_yield(());
827 box_region_allow_access!(for('tcx), (&'tcx GlobalCtxt<'tcx>), (gcx));
829 if sess.opts.debugging_opts.query_stats {
830 gcx.queries.print_stats();
837 /// Runs the resolution, type-checking, region checking and other
838 /// miscellaneous analysis passes on the crate.
839 fn analysis(tcx: TyCtxt<'_>, cnum: CrateNum) -> Result<()> {
840 assert_eq!(cnum, LOCAL_CRATE);
843 let mut entry_point = None;
845 time(sess, "misc checking 1", || {
847 entry_point = time(sess, "looking for entry point", || {
848 rustc_passes::entry::find_entry_point(tcx)
851 time(sess, "looking for plugin registrar", || {
852 plugin::build::find_plugin_registrar(tcx)
855 time(sess, "looking for derive registrar", || {
856 proc_macro_decls::find(tcx)
859 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
860 let local_def_id = tcx.hir().local_def_id(module);
861 tcx.ensure().check_mod_loops(local_def_id);
862 tcx.ensure().check_mod_attrs(local_def_id);
863 tcx.ensure().check_mod_unstable_api_usage(local_def_id);
868 // passes are timed inside typeck
869 typeck::check_crate(tcx)?;
871 time(sess, "misc checking 2", || {
873 time(sess, "match checking", || {
874 tcx.par_body_owners(|def_id| {
875 tcx.ensure().check_match(def_id);
879 time(sess, "liveness checking + intrinsic checking", || {
880 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
881 // this must run before MIR dump, because
882 // "not all control paths return a value" is reported here.
884 // maybe move the check to a MIR pass?
885 let local_def_id = tcx.hir().local_def_id(module);
887 tcx.ensure().check_mod_liveness(local_def_id);
888 tcx.ensure().check_mod_intrinsics(local_def_id);
894 time(sess, "MIR borrow checking", || {
895 tcx.par_body_owners(|def_id| tcx.ensure().mir_borrowck(def_id));
898 time(sess, "dumping Chalk-like clauses", || {
899 rustc_traits::lowering::dump_program_clauses(tcx);
902 time(sess, "MIR effect checking", || {
903 for def_id in tcx.body_owners() {
904 mir::transform::check_unsafety::check_unsafety(tcx, def_id)
908 time(sess, "layout testing", || layout_test::test_layout(tcx));
910 // Avoid overwhelming user with errors if borrow checking failed.
911 // I'm not sure how helpful this is, to be honest, but it avoids a
912 // lot of annoying errors in the compile-fail tests (basically,
913 // lint warnings and so on -- kindck used to do this abort, but
914 // kindck is gone now). -nmatsakis
915 if sess.has_errors() {
916 return Err(ErrorReported);
919 time(sess, "misc checking 3", || {
921 time(sess, "privacy access levels", || {
922 tcx.ensure().privacy_access_levels(LOCAL_CRATE);
925 time(sess, "private in public", || {
926 tcx.ensure().check_private_in_public(LOCAL_CRATE);
929 time(sess, "death checking", || rustc_passes::dead::check_crate(tcx));
931 time(sess, "unused lib feature checking", || {
932 stability::check_unused_or_stable_features(tcx)
935 time(sess, "lint checking", || {
936 lint::check_crate(tcx, || rustc_lint::BuiltinCombinedLateLintPass::new());
940 time(sess, "privacy checking modules", || {
941 par_iter(&tcx.hir().krate().modules).for_each(|(&module, _)| {
942 tcx.ensure().check_mod_privacy(tcx.hir().local_def_id(module));
951 fn encode_and_write_metadata(
953 outputs: &OutputFilenames,
954 ) -> (middle::cstore::EncodedMetadata, bool) {
955 #[derive(PartialEq, Eq, PartialOrd, Ord)]
962 let metadata_kind = tcx.sess.crate_types.borrow().iter().map(|ty| {
964 CrateType::Executable |
965 CrateType::Staticlib |
966 CrateType::Cdylib => MetadataKind::None,
968 CrateType::Rlib => MetadataKind::Uncompressed,
971 CrateType::ProcMacro => MetadataKind::Compressed,
973 }).max().unwrap_or(MetadataKind::None);
975 let metadata = match metadata_kind {
976 MetadataKind::None => middle::cstore::EncodedMetadata::new(),
977 MetadataKind::Uncompressed |
978 MetadataKind::Compressed => tcx.encode_metadata(),
981 let need_metadata_file = tcx.sess.opts.output_types.contains_key(&OutputType::Metadata);
982 if need_metadata_file {
983 let crate_name = &tcx.crate_name(LOCAL_CRATE).as_str();
984 let out_filename = filename_for_metadata(tcx.sess, crate_name, outputs);
985 // To avoid races with another rustc process scanning the output directory,
986 // we need to write the file somewhere else and atomically move it to its
987 // final destination, with an `fs::rename` call. In order for the rename to
988 // always succeed, the temporary file needs to be on the same filesystem,
989 // which is why we create it inside the output directory specifically.
990 let metadata_tmpdir = TempFileBuilder::new()
992 .tempdir_in(out_filename.parent().unwrap())
993 .unwrap_or_else(|err| {
994 tcx.sess.fatal(&format!("couldn't create a temp dir: {}", err))
996 let metadata_filename = emit_metadata(tcx.sess, &metadata, &metadata_tmpdir);
997 if let Err(e) = fs::rename(&metadata_filename, &out_filename) {
998 tcx.sess.fatal(&format!("failed to write {}: {}", out_filename.display(), e));
1000 if tcx.sess.opts.json_artifact_notifications {
1001 tcx.sess.parse_sess.span_diagnostic
1002 .emit_artifact_notification(&out_filename, "metadata");
1006 let need_metadata_module = metadata_kind == MetadataKind::Compressed;
1008 (metadata, need_metadata_module)
1011 /// Runs the codegen backend, after which the AST and analysis can
1013 pub fn start_codegen<'tcx>(
1014 codegen_backend: &dyn CodegenBackend,
1016 outputs: &OutputFilenames,
1018 if log_enabled!(::log::Level::Info) {
1019 println!("Pre-codegen");
1020 tcx.print_debug_stats();
1023 let (metadata, need_metadata_module) = time(tcx.sess, "metadata encoding and writing", || {
1024 encode_and_write_metadata(tcx, outputs)
1027 let codegen = time(tcx.sess, "codegen", move || {
1028 let _prof_timer = tcx.prof.generic_activity("codegen_crate");
1029 codegen_backend.codegen_crate(tcx, metadata, need_metadata_module)
1032 if log_enabled!(::log::Level::Info) {
1033 println!("Post-codegen");
1034 tcx.print_debug_stats();
1037 if tcx.sess.opts.output_types.contains_key(&OutputType::Mir) {
1038 if let Err(e) = mir::transform::dump_mir::emit_mir(tcx, outputs) {
1039 tcx.sess.err(&format!("could not emit MIR: {}", e));
1040 tcx.sess.abort_if_errors();