1 // Copyright 2014-2015 The Rust Project Developers. See the COPYRIGHT
2 // file at the top-level directory of this distribution and at
3 // http://rust-lang.org/COPYRIGHT.
5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
8 // option. This file may not be copied, modified, or distributed
9 // except according to those terms.
11 //! The Rust compiler.
15 //! This API is completely unstable and subject to change.
17 #![doc(html_logo_url = "https://www.rust-lang.org/logos/rust-logo-128x128-blk-v2.png",
18 html_favicon_url = "https://doc.rust-lang.org/favicon.ico",
19 html_root_url = "https://doc.rust-lang.org/nightly/")]
21 #![feature(box_syntax)]
22 #![cfg_attr(unix, feature(libc))]
25 #![feature(rustc_diagnostic_macros)]
26 #![feature(slice_sort_by_cached_key)]
27 #![feature(set_stdio)]
28 #![feature(rustc_stack_internals)]
31 #![recursion_limit="256"]
34 pub extern crate getopts;
35 extern crate graphviz;
36 extern crate env_logger;
39 extern crate rustc_rayon as rayon;
41 extern crate rustc_allocator;
42 extern crate rustc_target;
43 extern crate rustc_borrowck;
44 extern crate rustc_data_structures;
45 extern crate rustc_errors as errors;
46 extern crate rustc_passes;
47 extern crate rustc_lint;
48 extern crate rustc_plugin;
49 extern crate rustc_privacy;
50 extern crate rustc_incremental;
51 extern crate rustc_metadata;
52 extern crate rustc_mir;
53 extern crate rustc_resolve;
54 extern crate rustc_save_analysis;
55 extern crate rustc_traits;
56 extern crate rustc_codegen_utils;
57 extern crate rustc_typeck;
58 extern crate scoped_tls;
59 extern crate serialize;
60 extern crate smallvec;
64 extern crate syntax_ext;
65 extern crate syntax_pos;
67 // Note that the linkage here should be all that we need, on Linux we're not
68 // prefixing the symbols here so this should naturally override our default
69 // allocator. On OSX it should override via the zone allocator. We shouldn't
70 // enable this by default on other platforms, so other platforms aren't handled
72 #[cfg(feature = "jemalloc-sys")]
73 extern crate jemalloc_sys;
75 use driver::CompileController;
76 use pretty::{PpMode, UserIdentifiedItem};
78 use rustc_resolve as resolve;
79 use rustc_save_analysis as save;
80 use rustc_save_analysis::DumpHandler;
81 use rustc_data_structures::sync::{self, Lrc};
82 use rustc_data_structures::OnDrop;
83 use rustc::session::{self, config, Session, build_session, CompileResult};
84 use rustc::session::CompileIncomplete;
85 use rustc::session::config::{Input, PrintRequest, ErrorOutputType};
86 use rustc::session::config::nightly_options;
87 use rustc::session::filesearch;
88 use rustc::session::{early_error, early_warn};
89 use rustc::lint::Lint;
91 use rustc_metadata::locator;
92 use rustc_metadata::cstore::CStore;
93 use rustc_metadata::dynamic_lib::DynamicLibrary;
94 use rustc::util::common::{time, ErrorReported};
95 use rustc_codegen_utils::codegen_backend::CodegenBackend;
97 use serialize::json::ToJson;
100 use std::borrow::Cow;
102 use std::default::Default;
103 use std::env::consts::{DLL_PREFIX, DLL_SUFFIX};
105 use std::error::Error;
106 use std::ffi::OsString;
107 use std::fmt::{self, Display};
108 use std::io::{self, Read, Write};
111 use std::path::{PathBuf, Path};
112 use std::process::{self, Command, Stdio};
114 use std::sync::atomic::{AtomicBool, ATOMIC_BOOL_INIT, Ordering};
115 use std::sync::{Once, ONCE_INIT};
119 use syntax::source_map::{SourceMap, FileLoader, RealFileLoader};
120 use syntax::feature_gate::{GatedCfg, UnstableFeatures};
121 use syntax::parse::{self, PResult};
122 use syntax_pos::{DUMMY_SP, MultiSpan, FileName};
130 mod proc_macro_decls;
132 pub mod target_features {
134 use syntax::symbol::Symbol;
135 use rustc::session::Session;
136 use rustc_codegen_utils::codegen_backend::CodegenBackend;
138 /// Add `target_feature = "..."` cfgs for a variety of platform
139 /// specific features (SSE, NEON etc.).
141 /// This is performed by checking whether a whitelisted set of
142 /// features is available on the target machine, by querying LLVM.
143 pub fn add_configuration(cfg: &mut ast::CrateConfig,
145 codegen_backend: &dyn CodegenBackend) {
146 let tf = Symbol::intern("target_feature");
148 cfg.extend(codegen_backend.target_features(sess).into_iter().map(|feat| (tf, Some(feat))));
150 if sess.crt_static_feature() {
151 cfg.insert((tf, Some(Symbol::intern("crt-static"))));
156 /// Exit status code used for successful compilation and help output.
157 pub const EXIT_SUCCESS: isize = 0;
159 /// Exit status code used for compilation failures and invalid flags.
160 pub const EXIT_FAILURE: isize = 1;
162 const BUG_REPORT_URL: &str = "https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.\
165 const ICE_REPORT_COMPILER_FLAGS: &[&str] = &["Z", "C", "crate-type"];
167 const ICE_REPORT_COMPILER_FLAGS_EXCLUDE: &[&str] = &["metadata", "extra-filename"];
169 const ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE: &[&str] = &["incremental"];
171 pub fn abort_on_err<T>(result: Result<T, CompileIncomplete>, sess: &Session) -> T {
173 Err(CompileIncomplete::Errored(ErrorReported)) => {
174 sess.abort_if_errors();
175 panic!("error reported but abort_if_errors didn't abort???");
177 Err(CompileIncomplete::Stopped) => {
178 sess.fatal("compilation terminated");
184 pub fn run<F>(run_compiler: F) -> isize
185 where F: FnOnce() -> (CompileResult, Option<Session>) + Send + 'static
187 let result = monitor(move || {
188 syntax::with_globals(|| {
189 let (result, session) = run_compiler();
190 if let Err(CompileIncomplete::Errored(_)) = result {
193 sess.abort_if_errors();
194 panic!("error reported but abort_if_errors didn't abort???");
198 errors::emitter::EmitterWriter::stderr(
199 errors::ColorConfig::Auto,
204 let handler = errors::Handler::with_emitter(true, false, Box::new(emitter));
205 handler.emit(&MultiSpan::new(),
206 "aborting due to previous error(s)",
207 errors::Level::Fatal);
208 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
216 Ok(()) => EXIT_SUCCESS,
217 Err(_) => EXIT_FAILURE,
221 fn load_backend_from_dylib(path: &Path) -> fn() -> Box<dyn CodegenBackend> {
222 let lib = DynamicLibrary::open(Some(path)).unwrap_or_else(|err| {
223 let err = format!("couldn't load codegen backend {:?}: {:?}", path, err);
224 early_error(ErrorOutputType::default(), &err);
227 match lib.symbol("__rustc_codegen_backend") {
230 mem::transmute::<*mut u8, _>(f)
233 let err = format!("couldn't load codegen backend as it \
234 doesn't export the `__rustc_codegen_backend` \
236 early_error(ErrorOutputType::default(), &err);
242 pub fn get_codegen_backend(sess: &Session) -> Box<dyn CodegenBackend> {
243 static INIT: Once = ONCE_INIT;
247 static mut LOAD: fn() -> Box<dyn CodegenBackend> = || unreachable!();
250 let codegen_name = sess.opts.debugging_opts.codegen_backend.as_ref()
251 .unwrap_or(&sess.target.target.options.codegen_backend);
252 let backend = match &codegen_name[..] {
254 rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::boxed
256 filename if filename.contains(".") => {
257 load_backend_from_dylib(filename.as_ref())
259 codegen_name => get_codegen_sysroot(codegen_name),
266 let backend = unsafe { LOAD() };
271 fn get_codegen_sysroot(backend_name: &str) -> fn() -> Box<dyn CodegenBackend> {
272 // For now we only allow this function to be called once as it'll dlopen a
273 // few things, which seems to work best if we only do that once. In
274 // general this assertion never trips due to the once guard in `get_codegen_backend`,
275 // but there's a few manual calls to this function in this file we protect
277 static LOADED: AtomicBool = ATOMIC_BOOL_INIT;
278 assert!(!LOADED.fetch_or(true, Ordering::SeqCst),
279 "cannot load the default codegen backend twice");
281 // When we're compiling this library with `--test` it'll run as a binary but
282 // not actually exercise much functionality. As a result most of the logic
283 // here is defunkt (it assumes we're a dynamic library in a sysroot) so
284 // let's just return a dummy creation function which won't be used in
287 return rustc_codegen_utils::codegen_backend::MetadataOnlyCodegenBackend::boxed
290 let target = session::config::host_triple();
291 let mut sysroot_candidates = vec![filesearch::get_or_default_sysroot()];
292 let path = current_dll_path()
293 .and_then(|s| s.canonicalize().ok());
294 if let Some(dll) = path {
295 // use `parent` twice to chop off the file name and then also the
296 // directory containing the dll which should be either `lib` or `bin`.
297 if let Some(path) = dll.parent().and_then(|p| p.parent()) {
298 // The original `path` pointed at the `rustc_driver` crate's dll.
299 // Now that dll should only be in one of two locations. The first is
300 // in the compiler's libdir, for example `$sysroot/lib/*.dll`. The
301 // other is the target's libdir, for example
302 // `$sysroot/lib/rustlib/$target/lib/*.dll`.
304 // We don't know which, so let's assume that if our `path` above
305 // ends in `$target` we *could* be in the target libdir, and always
306 // assume that we may be in the main libdir.
307 sysroot_candidates.push(path.to_owned());
309 if path.ends_with(target) {
310 sysroot_candidates.extend(path.parent() // chop off `$target`
311 .and_then(|p| p.parent()) // chop off `rustlib`
312 .and_then(|p| p.parent()) // chop off `lib`
313 .map(|s| s.to_owned()));
318 let sysroot = sysroot_candidates.iter()
320 let libdir = filesearch::relative_target_lib_path(&sysroot, &target);
321 sysroot.join(libdir).with_file_name(
322 option_env!("CFG_CODEGEN_BACKENDS_DIR").unwrap_or("codegen-backends"))
325 info!("codegen backend candidate: {}", f.display());
329 let sysroot = sysroot.unwrap_or_else(|| {
330 let candidates = sysroot_candidates.iter()
331 .map(|p| p.display().to_string())
334 let err = format!("failed to find a `codegen-backends` folder \
335 in the sysroot candidates:\n* {}", candidates);
336 early_error(ErrorOutputType::default(), &err);
338 info!("probing {} for a codegen backend", sysroot.display());
340 let d = sysroot.read_dir().unwrap_or_else(|e| {
341 let err = format!("failed to load default codegen backend, couldn't \
342 read `{}`: {}", sysroot.display(), e);
343 early_error(ErrorOutputType::default(), &err);
346 let mut file: Option<PathBuf> = None;
348 let expected_name = format!("rustc_codegen_llvm-{}", backend_name);
349 for entry in d.filter_map(|e| e.ok()) {
350 let path = entry.path();
351 let filename = match path.file_name().and_then(|s| s.to_str()) {
355 if !(filename.starts_with(DLL_PREFIX) && filename.ends_with(DLL_SUFFIX)) {
358 let name = &filename[DLL_PREFIX.len() .. filename.len() - DLL_SUFFIX.len()];
359 if name != expected_name {
362 if let Some(ref prev) = file {
363 let err = format!("duplicate codegen backends found\n\
366 ", prev.display(), path.display());
367 early_error(ErrorOutputType::default(), &err);
369 file = Some(path.clone());
373 Some(ref s) => return load_backend_from_dylib(s),
375 let err = format!("failed to load default codegen backend for `{}`, \
376 no appropriate codegen dylib found in `{}`",
377 backend_name, sysroot.display());
378 early_error(ErrorOutputType::default(), &err);
383 fn current_dll_path() -> Option<PathBuf> {
384 use std::ffi::{OsStr, CStr};
385 use std::os::unix::prelude::*;
388 let addr = current_dll_path as usize as *mut _;
389 let mut info = mem::zeroed();
390 if libc::dladdr(addr, &mut info) == 0 {
391 info!("dladdr failed");
394 if info.dli_fname.is_null() {
395 info!("dladdr returned null pointer");
398 let bytes = CStr::from_ptr(info.dli_fname).to_bytes();
399 let os = OsStr::from_bytes(bytes);
400 Some(PathBuf::from(os))
405 fn current_dll_path() -> Option<PathBuf> {
406 use std::ffi::OsString;
407 use std::os::windows::prelude::*;
410 fn GetModuleHandleExW(dwFlags: u32,
412 phModule: *mut usize) -> i32;
413 fn GetModuleFileNameW(hModule: usize,
414 lpFilename: *mut u16,
418 const GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS: u32 = 0x00000004;
422 let r = GetModuleHandleExW(GET_MODULE_HANDLE_EX_FLAG_FROM_ADDRESS,
423 current_dll_path as usize,
426 info!("GetModuleHandleExW failed: {}", io::Error::last_os_error());
429 let mut space = Vec::with_capacity(1024);
430 let r = GetModuleFileNameW(module,
432 space.capacity() as u32);
434 info!("GetModuleFileNameW failed: {}", io::Error::last_os_error());
438 if r >= space.capacity() {
439 info!("our buffer was too small? {}",
440 io::Error::last_os_error());
444 let os = OsString::from_wide(&space);
445 Some(PathBuf::from(os))
450 // Parse args and run the compiler. This is the primary entry point for rustc.
451 // See comments on CompilerCalls below for details about the callbacks argument.
452 // The FileLoader provides a way to load files from sources other than the file system.
453 pub fn run_compiler<'a>(args: &[String],
454 callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
455 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
456 emitter_dest: Option<Box<dyn Write + Send>>)
457 -> (CompileResult, Option<Session>)
459 let matches = match handle_options(args) {
460 Some(matches) => matches,
461 None => return (Ok(()), None),
464 let (sopts, cfg) = config::build_session_options_and_crate_config(&matches);
466 driver::spawn_thread_pool(sopts, |sopts| {
467 run_compiler_with_pool(matches, sopts, cfg, callbacks, file_loader, emitter_dest)
471 fn run_compiler_with_pool<'a>(
472 matches: getopts::Matches,
473 sopts: config::Options,
474 cfg: ast::CrateConfig,
475 mut callbacks: Box<dyn CompilerCalls<'a> + sync::Send + 'a>,
476 file_loader: Option<Box<dyn FileLoader + Send + Sync + 'static>>,
477 emitter_dest: Option<Box<dyn Write + Send>>
478 ) -> (CompileResult, Option<Session>) {
479 macro_rules! do_or_return {($expr: expr, $sess: expr) => {
481 Compilation::Stop => return (Ok(()), $sess),
482 Compilation::Continue => {}
486 let descriptions = diagnostics_registry();
488 do_or_return!(callbacks.early_callback(&matches,
495 let (odir, ofile) = make_output(&matches);
496 let (input, input_file_path, input_err) = match make_input(&matches.free) {
497 Some((input, input_file_path, input_err)) => {
498 let (input, input_file_path) = callbacks.some_input(input, input_file_path);
499 (input, input_file_path, input_err)
501 None => match callbacks.no_input(&matches, &sopts, &cfg, &odir, &ofile, &descriptions) {
502 Some((input, input_file_path)) => (input, input_file_path, None),
503 None => return (Ok(()), None),
507 let loader = file_loader.unwrap_or(box RealFileLoader);
508 let source_map = Lrc::new(SourceMap::with_file_loader(loader, sopts.file_path_mapping()));
509 let mut sess = session::build_session_with_source_map(
510 sopts, input_file_path.clone(), descriptions, source_map, emitter_dest,
513 if let Some(err) = input_err {
514 // Immediately stop compilation if there was an issue reading
515 // the input (for example if the input stream is not UTF-8).
516 sess.err(&err.to_string());
517 return (Err(CompileIncomplete::Stopped), Some(sess));
520 let codegen_backend = get_codegen_backend(&sess);
522 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
524 let mut cfg = config::build_configuration(&sess, cfg);
525 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
526 sess.parse_sess.config = cfg;
529 let plugins = sess.opts.debugging_opts.extra_plugins.clone();
531 let cstore = CStore::new(codegen_backend.metadata_loader());
533 do_or_return!(callbacks.late_callback(&*codegen_backend,
539 &ofile), Some(sess));
541 let _sess_abort_error = OnDrop(|| sess.diagnostic().print_error_count());
543 let control = callbacks.build_controller(&sess, &matches);
545 driver::compile_input(codegen_backend,
560 pub fn set_sigpipe_handler() {
562 // Set the SIGPIPE signal handler, so that an EPIPE
563 // will cause rustc to terminate, as expected.
564 assert_ne!(libc::signal(libc::SIGPIPE, libc::SIG_DFL), libc::SIG_ERR);
569 pub fn set_sigpipe_handler() {}
571 // Extract output directory and file from matches.
572 fn make_output(matches: &getopts::Matches) -> (Option<PathBuf>, Option<PathBuf>) {
573 let odir = matches.opt_str("out-dir").map(|o| PathBuf::from(&o));
574 let ofile = matches.opt_str("o").map(|o| PathBuf::from(&o));
578 // Extract input (string or file and optional path) from matches.
579 fn make_input(free_matches: &[String]) -> Option<(Input, Option<PathBuf>, Option<io::Error>)> {
580 if free_matches.len() == 1 {
581 let ifile = &free_matches[0];
583 let mut src = String::new();
584 let err = if io::stdin().read_to_string(&mut src).is_err() {
585 Some(io::Error::new(io::ErrorKind::InvalidData,
586 "couldn't read from stdin, as it did not contain valid UTF-8"))
590 Some((Input::Str { name: FileName::anon_source_code(&src), input: src },
593 Some((Input::File(PathBuf::from(ifile)),
594 Some(PathBuf::from(ifile)), None))
601 fn parse_pretty(sess: &Session,
602 matches: &getopts::Matches)
603 -> Option<(PpMode, Option<UserIdentifiedItem>)> {
604 let pretty = if sess.opts.debugging_opts.unstable_options {
605 matches.opt_default("pretty", "normal").map(|a| {
606 // stable pretty-print variants only
607 pretty::parse_pretty(sess, &a, false)
613 if pretty.is_none() {
614 sess.opts.debugging_opts.unpretty.as_ref().map(|a| {
615 // extended with unstable pretty-print variants
616 pretty::parse_pretty(sess, &a, true)
623 // Whether to stop or continue compilation.
624 #[derive(Copy, Clone, Debug, Eq, PartialEq)]
625 pub enum Compilation {
631 pub fn and_then<F: FnOnce() -> Compilation>(self, next: F) -> Compilation {
633 Compilation::Stop => Compilation::Stop,
634 Compilation::Continue => next(),
639 /// A trait for customizing the compilation process. Offers a number of hooks for
640 /// executing custom code or customizing input.
641 pub trait CompilerCalls<'a> {
642 /// Hook for a callback early in the process of handling arguments. This will
643 /// be called straight after options have been parsed but before anything
644 /// else (e.g., selecting input and output).
645 fn early_callback(&mut self,
646 _: &getopts::Matches,
648 _: &ast::CrateConfig,
649 _: &errors::registry::Registry,
652 Compilation::Continue
655 /// Hook for a callback late in the process of handling arguments. This will
656 /// be called just before actual compilation starts (and before build_controller
657 /// is called), after all arguments etc. have been completely handled.
658 fn late_callback(&mut self,
659 _: &dyn CodegenBackend,
660 _: &getopts::Matches,
667 Compilation::Continue
670 /// Called after we extract the input from the arguments. Gives the implementer
671 /// an opportunity to change the inputs or to add some custom input handling.
672 /// The default behaviour is to simply pass through the inputs.
673 fn some_input(&mut self,
675 input_path: Option<PathBuf>)
676 -> (Input, Option<PathBuf>) {
680 /// Called after we extract the input from the arguments if there is no valid
681 /// input. Gives the implementer an opportunity to supply alternate input (by
682 /// returning a Some value) or to add custom behaviour for this error such as
683 /// emitting error messages. Returning None will cause compilation to stop
685 fn no_input(&mut self,
686 _: &getopts::Matches,
688 _: &ast::CrateConfig,
691 _: &errors::registry::Registry)
692 -> Option<(Input, Option<PathBuf>)> {
696 // Create a CompilController struct for controlling the behaviour of
702 ) -> CompileController<'a>;
705 /// CompilerCalls instance for a regular rustc build.
706 #[derive(Copy, Clone)]
707 pub struct RustcDefaultCalls;
709 // FIXME remove these and use winapi 0.3 instead
710 // Duplicates: bootstrap/compile.rs, librustc_errors/emitter.rs
712 fn stdout_isatty() -> bool {
713 unsafe { libc::isatty(libc::STDOUT_FILENO) != 0 }
717 fn stdout_isatty() -> bool {
720 type HANDLE = *mut u8;
721 type LPDWORD = *mut u32;
722 const STD_OUTPUT_HANDLE: DWORD = -11i32 as DWORD;
724 fn GetStdHandle(which: DWORD) -> HANDLE;
725 fn GetConsoleMode(hConsoleHandle: HANDLE, lpMode: LPDWORD) -> BOOL;
728 let handle = GetStdHandle(STD_OUTPUT_HANDLE);
730 GetConsoleMode(handle, &mut out) != 0
734 fn handle_explain(code: &str,
735 descriptions: &errors::registry::Registry,
736 output: ErrorOutputType) {
737 let normalised = if code.starts_with("E") {
740 format!("E{0:0>4}", code)
742 match descriptions.find_description(&normalised) {
743 Some(ref description) => {
744 let mut is_in_code_block = false;
745 let mut text = String::new();
747 // Slice off the leading newline and print.
748 for line in description[1..].lines() {
749 let indent_level = line.find(|c: char| !c.is_whitespace())
750 .unwrap_or_else(|| line.len());
751 let dedented_line = &line[indent_level..];
752 if dedented_line.starts_with("```") {
753 is_in_code_block = !is_in_code_block;
754 text.push_str(&line[..(indent_level+3)]);
755 } else if is_in_code_block && dedented_line.starts_with("# ") {
764 show_content_with_pager(&text);
770 early_error(output, &format!("no extended information for {}", code));
775 fn show_content_with_pager(content: &String) {
776 let pager_name = env::var_os("PAGER").unwrap_or_else(|| if cfg!(windows) {
777 OsString::from("more.com")
779 OsString::from("less")
782 let mut fallback_to_println = false;
784 match Command::new(pager_name).stdin(Stdio::piped()).spawn() {
786 if let Some(pipe) = pager.stdin.as_mut() {
787 if pipe.write_all(content.as_bytes()).is_err() {
788 fallback_to_println = true;
792 if pager.wait().is_err() {
793 fallback_to_println = true;
797 fallback_to_println = true;
801 // If pager fails for whatever reason, we should still print the content
802 // to standard output
803 if fallback_to_println {
804 print!("{}", content);
808 impl<'a> CompilerCalls<'a> for RustcDefaultCalls {
809 fn early_callback(&mut self,
810 matches: &getopts::Matches,
812 _: &ast::CrateConfig,
813 descriptions: &errors::registry::Registry,
814 output: ErrorOutputType)
816 if let Some(ref code) = matches.opt_str("explain") {
817 handle_explain(code, descriptions, output);
818 return Compilation::Stop;
821 Compilation::Continue
824 fn no_input(&mut self,
825 matches: &getopts::Matches,
826 sopts: &config::Options,
827 cfg: &ast::CrateConfig,
828 odir: &Option<PathBuf>,
829 ofile: &Option<PathBuf>,
830 descriptions: &errors::registry::Registry)
831 -> Option<(Input, Option<PathBuf>)> {
832 match matches.free.len() {
834 let mut sess = build_session(sopts.clone(),
836 descriptions.clone());
837 if sopts.describe_lints {
838 let mut ls = lint::LintStore::new();
839 rustc_lint::register_builtins(&mut ls, Some(&sess));
840 describe_lints(&sess, &ls, false);
843 rustc_lint::register_builtins(&mut sess.lint_store.borrow_mut(), Some(&sess));
844 let mut cfg = config::build_configuration(&sess, cfg.clone());
845 let codegen_backend = get_codegen_backend(&sess);
846 target_features::add_configuration(&mut cfg, &sess, &*codegen_backend);
847 sess.parse_sess.config = cfg;
848 let should_stop = RustcDefaultCalls::print_crate_info(
856 if should_stop == Compilation::Stop {
859 early_error(sopts.error_format, "no input filename given");
861 1 => panic!("make_input should have provided valid inputs"),
862 _ => early_error(sopts.error_format, "multiple input filenames provided"),
866 fn late_callback(&mut self,
867 codegen_backend: &dyn CodegenBackend,
868 matches: &getopts::Matches,
872 odir: &Option<PathBuf>,
873 ofile: &Option<PathBuf>)
875 RustcDefaultCalls::print_crate_info(codegen_backend, sess, Some(input), odir, ofile)
876 .and_then(|| RustcDefaultCalls::list_metadata(sess, cstore, matches, input))
879 fn build_controller(self: Box<Self>,
881 matches: &getopts::Matches)
882 -> CompileController<'a> {
883 let mut control = CompileController::basic();
885 control.keep_ast = sess.opts.debugging_opts.keep_ast;
886 control.continue_parse_after_error = sess.opts.debugging_opts.continue_parse_after_error;
888 if let Some((ppm, opt_uii)) = parse_pretty(sess, matches) {
889 if ppm.needs_ast_map(&opt_uii) {
890 control.after_hir_lowering.stop = Compilation::Stop;
892 control.after_parse.callback = box move |state| {
893 state.krate = Some(pretty::fold_crate(state.session,
894 state.krate.take().unwrap(),
897 control.after_hir_lowering.callback = box move |state| {
898 pretty::print_after_hir_lowering(state.session,
899 state.cstore.unwrap(),
900 state.hir_map.unwrap(),
901 state.analysis.unwrap(),
902 state.resolutions.unwrap(),
904 &state.expanded_crate.take().unwrap(),
905 state.crate_name.unwrap(),
907 state.arenas.unwrap(),
908 state.output_filenames.unwrap(),
913 control.after_parse.stop = Compilation::Stop;
915 control.after_parse.callback = box move |state| {
916 let krate = pretty::fold_crate(state.session, state.krate.take().unwrap(), ppm);
917 pretty::print_after_parsing(state.session,
928 if sess.opts.debugging_opts.parse_only ||
929 sess.opts.debugging_opts.show_span.is_some() ||
930 sess.opts.debugging_opts.ast_json_noexpand {
931 control.after_parse.stop = Compilation::Stop;
934 if sess.opts.debugging_opts.no_analysis ||
935 sess.opts.debugging_opts.ast_json {
936 control.after_hir_lowering.stop = Compilation::Stop;
939 if sess.opts.debugging_opts.save_analysis {
940 enable_save_analysis(&mut control);
943 if sess.print_fuel_crate.is_some() {
944 let old_callback = control.compilation_done.callback;
945 control.compilation_done.callback = box move |state| {
947 let sess = state.session;
948 eprintln!("Fuel used by {}: {}",
949 sess.print_fuel_crate.as_ref().unwrap(),
950 sess.print_fuel.get());
957 pub fn enable_save_analysis(control: &mut CompileController) {
958 control.keep_ast = true;
959 control.after_analysis.callback = box |state| {
960 time(state.session, "save analysis", || {
961 save::process_crate(state.tcx.unwrap(),
962 state.expanded_crate.unwrap(),
963 state.analysis.unwrap(),
964 state.crate_name.unwrap(),
967 DumpHandler::new(state.out_dir,
968 state.crate_name.unwrap()))
971 control.after_analysis.run_callback_on_error = true;
972 control.make_glob_map = resolve::MakeGlobMap::Yes;
975 impl RustcDefaultCalls {
976 pub fn list_metadata(sess: &Session,
978 matches: &getopts::Matches,
981 let r = matches.opt_strs("Z");
982 if r.iter().any(|s| *s == "ls") {
984 &Input::File(ref ifile) => {
985 let path = &(*ifile);
986 let mut v = Vec::new();
987 locator::list_file_metadata(&sess.target.target,
989 &*cstore.metadata_loader,
992 println!("{}", String::from_utf8(v).unwrap());
994 &Input::Str { .. } => {
995 early_error(ErrorOutputType::default(), "cannot list metadata for stdin");
998 return Compilation::Stop;
1001 Compilation::Continue
1005 fn print_crate_info(codegen_backend: &dyn CodegenBackend,
1007 input: Option<&Input>,
1008 odir: &Option<PathBuf>,
1009 ofile: &Option<PathBuf>)
1011 use rustc::session::config::PrintRequest::*;
1012 // PrintRequest::NativeStaticLibs is special - printed during linking
1013 // (empty iterator returns true)
1014 if sess.opts.prints.iter().all(|&p| p == PrintRequest::NativeStaticLibs) {
1015 return Compilation::Continue;
1018 let attrs = match input {
1021 let result = parse_crate_attrs(sess, input);
1023 Ok(attrs) => Some(attrs),
1024 Err(mut parse_error) => {
1026 return Compilation::Stop;
1031 for req in &sess.opts.prints {
1034 let mut targets = rustc_target::spec::get_targets().collect::<Vec<String>>();
1036 println!("{}", targets.join("\n"));
1038 Sysroot => println!("{}", sess.sysroot.display()),
1039 TargetSpec => println!("{}", sess.target.target.to_json().pretty()),
1040 FileNames | CrateName => {
1041 let input = input.unwrap_or_else(||
1042 early_error(ErrorOutputType::default(), "no input file provided"));
1043 let attrs = attrs.as_ref().unwrap();
1044 let t_outputs = driver::build_output_filenames(input, odir, ofile, attrs, sess);
1045 let id = rustc_codegen_utils::link::find_crate_name(Some(sess), attrs, input);
1046 if *req == PrintRequest::CrateName {
1050 let crate_types = driver::collect_crate_types(sess, attrs);
1051 for &style in &crate_types {
1052 let fname = rustc_codegen_utils::link::filename_for_input(
1058 println!("{}", fname.file_name().unwrap().to_string_lossy());
1062 let allow_unstable_cfg = UnstableFeatures::from_environment()
1063 .is_nightly_build();
1065 let mut cfgs = sess.parse_sess.config.iter().filter_map(|&(name, ref value)| {
1066 let gated_cfg = GatedCfg::gate(&ast::MetaItem {
1067 ident: ast::Path::from_ident(ast::Ident::with_empty_ctxt(name)),
1068 node: ast::MetaItemKind::Word,
1072 // Note that crt-static is a specially recognized cfg
1073 // directive that's printed out here as part of
1074 // rust-lang/rust#37406, but in general the
1075 // `target_feature` cfg is gated under
1076 // rust-lang/rust#29717. For now this is just
1077 // specifically allowing the crt-static cfg and that's
1078 // it, this is intended to get into Cargo and then go
1079 // through to build scripts.
1080 let value = value.as_ref().map(|s| s.as_str());
1081 let value = value.as_ref().map(|s| s.as_ref());
1082 if name != "target_feature" || value != Some("crt-static") {
1083 if !allow_unstable_cfg && gated_cfg.is_some() {
1088 if let Some(value) = value {
1089 Some(format!("{}=\"{}\"", name, value))
1091 Some(name.to_string())
1093 }).collect::<Vec<String>>();
1097 println!("{}", cfg);
1100 RelocationModels | CodeModels | TlsModels | TargetCPUs | TargetFeatures => {
1101 codegen_backend.print(*req, sess);
1103 // Any output here interferes with Cargo's parsing of other printed output
1104 PrintRequest::NativeStaticLibs => {}
1107 return Compilation::Stop;
1111 /// Returns a version string such as "0.12.0-dev".
1112 fn release_str() -> Option<&'static str> {
1113 option_env!("CFG_RELEASE")
1116 /// Returns the full SHA1 hash of HEAD of the Git repo from which rustc was built.
1117 fn commit_hash_str() -> Option<&'static str> {
1118 option_env!("CFG_VER_HASH")
1121 /// Returns the "commit date" of HEAD of the Git repo from which rustc was built as a static string.
1122 fn commit_date_str() -> Option<&'static str> {
1123 option_env!("CFG_VER_DATE")
1126 /// Prints version information
1127 pub fn version(binary: &str, matches: &getopts::Matches) {
1128 let verbose = matches.opt_present("verbose");
1130 println!("{} {}", binary, option_env!("CFG_VERSION").unwrap_or("unknown version"));
1133 fn unw(x: Option<&str>) -> &str {
1134 x.unwrap_or("unknown")
1136 println!("binary: {}", binary);
1137 println!("commit-hash: {}", unw(commit_hash_str()));
1138 println!("commit-date: {}", unw(commit_date_str()));
1139 println!("host: {}", config::host_triple());
1140 println!("release: {}", unw(release_str()));
1141 get_codegen_sysroot("llvm")().print_version();
1145 fn usage(verbose: bool, include_unstable_options: bool) {
1146 let groups = if verbose {
1147 config::rustc_optgroups()
1149 config::rustc_short_optgroups()
1151 let mut options = getopts::Options::new();
1152 for option in groups.iter().filter(|x| include_unstable_options || x.is_stable()) {
1153 (option.apply)(&mut options);
1155 let message = "Usage: rustc [OPTIONS] INPUT";
1156 let nightly_help = if nightly_options::is_nightly_build() {
1157 "\n -Z help Print internal options for debugging rustc"
1161 let verbose_help = if verbose {
1164 "\n --help -v Print the full set of options rustc accepts"
1166 println!("{}\nAdditional help:
1167 -C help Print codegen options
1169 Print 'lint' options and default settings{}{}\n",
1170 options.usage(message),
1175 fn print_wall_help() {
1177 The flag `-Wall` does not exist in `rustc`. Most useful lints are enabled by
1178 default. Use `rustc -W help` to see all available lints. It's more common to put
1179 warning settings in the crate root using `#![warn(LINT_NAME)]` instead of using
1180 the command line flag directly.
1184 fn describe_lints(sess: &Session, lint_store: &lint::LintStore, loaded_plugins: bool) {
1186 Available lint options:
1187 -W <foo> Warn about <foo>
1191 -F <foo> Forbid <foo> \
1192 (deny <foo> and all attempts to override)
1196 fn sort_lints(sess: &Session, lints: Vec<(&'static Lint, bool)>) -> Vec<&'static Lint> {
1197 let mut lints: Vec<_> = lints.into_iter().map(|(x, _)| x).collect();
1198 // The sort doesn't case-fold but it's doubtful we care.
1199 lints.sort_by_cached_key(|x: &&Lint| (x.default_level(sess), x.name));
1203 fn sort_lint_groups(lints: Vec<(&'static str, Vec<lint::LintId>, bool)>)
1204 -> Vec<(&'static str, Vec<lint::LintId>)> {
1205 let mut lints: Vec<_> = lints.into_iter().map(|(x, y, _)| (x, y)).collect();
1206 lints.sort_by_key(|l| l.0);
1210 let (plugin, builtin): (Vec<_>, _) = lint_store.get_lints()
1213 .partition(|&(_, p)| p);
1214 let plugin = sort_lints(sess, plugin);
1215 let builtin = sort_lints(sess, builtin);
1217 let (plugin_groups, builtin_groups): (Vec<_>, _) = lint_store.get_lint_groups()
1220 .partition(|&(.., p)| p);
1221 let plugin_groups = sort_lint_groups(plugin_groups);
1222 let builtin_groups = sort_lint_groups(builtin_groups);
1224 let max_name_len = plugin.iter()
1226 .map(|&s| s.name.chars().count())
1229 let padded = |x: &str| {
1230 let mut s = " ".repeat(max_name_len - x.chars().count());
1235 println!("Lint checks provided by rustc:\n");
1236 println!(" {} {:7.7} {}", padded("name"), "default", "meaning");
1237 println!(" {} {:7.7} {}", padded("----"), "-------", "-------");
1239 let print_lints = |lints: Vec<&Lint>| {
1241 let name = lint.name_lower().replace("_", "-");
1242 println!(" {} {:7.7} {}",
1244 lint.default_level.as_str(),
1250 print_lints(builtin);
1252 let max_name_len = max("warnings".len(),
1253 plugin_groups.iter()
1254 .chain(&builtin_groups)
1255 .map(|&(s, _)| s.chars().count())
1259 let padded = |x: &str| {
1260 let mut s = " ".repeat(max_name_len - x.chars().count());
1265 println!("Lint groups provided by rustc:\n");
1266 println!(" {} {}", padded("name"), "sub-lints");
1267 println!(" {} {}", padded("----"), "---------");
1268 println!(" {} {}", padded("warnings"), "all lints that are set to issue warnings");
1270 let print_lint_groups = |lints: Vec<(&'static str, Vec<lint::LintId>)>| {
1271 for (name, to) in lints {
1272 let name = name.to_lowercase().replace("_", "-");
1273 let desc = to.into_iter()
1274 .map(|x| x.to_string().replace("_", "-"))
1275 .collect::<Vec<String>>()
1277 println!(" {} {}", padded(&name), desc);
1282 print_lint_groups(builtin_groups);
1284 match (loaded_plugins, plugin.len(), plugin_groups.len()) {
1285 (false, 0, _) | (false, _, 0) => {
1286 println!("Compiler plugins can provide additional lints and lint groups. To see a \
1287 listing of these, re-run `rustc -W help` with a crate filename.");
1289 (false, ..) => panic!("didn't load lint plugins but got them anyway!"),
1290 (true, 0, 0) => println!("This crate does not load any lint plugins or lint groups."),
1293 println!("Lint checks provided by plugins loaded by this crate:\n");
1294 print_lints(plugin);
1297 println!("Lint groups provided by plugins loaded by this crate:\n");
1298 print_lint_groups(plugin_groups);
1304 fn describe_debug_flags() {
1305 println!("\nAvailable debug options:\n");
1306 print_flag_list("-Z", config::DB_OPTIONS);
1309 fn describe_codegen_flags() {
1310 println!("\nAvailable codegen options:\n");
1311 print_flag_list("-C", config::CG_OPTIONS);
1314 fn print_flag_list<T>(cmdline_opt: &str,
1315 flag_list: &[(&'static str, T, Option<&'static str>, &'static str)]) {
1316 let max_len = flag_list.iter()
1317 .map(|&(name, _, opt_type_desc, _)| {
1318 let extra_len = match opt_type_desc {
1322 name.chars().count() + extra_len
1327 for &(name, _, opt_type_desc, desc) in flag_list {
1328 let (width, extra) = match opt_type_desc {
1329 Some(..) => (max_len - 4, "=val"),
1330 None => (max_len, ""),
1332 println!(" {} {:>width$}{} -- {}",
1334 name.replace("_", "-"),
1341 /// Process command line options. Emits messages as appropriate. If compilation
1342 /// should continue, returns a getopts::Matches object parsed from args,
1343 /// otherwise returns None.
1345 /// The compiler's handling of options is a little complicated as it ties into
1346 /// our stability story, and it's even *more* complicated by historical
1347 /// accidents. The current intention of each compiler option is to have one of
1350 /// 1. An option is stable and can be used everywhere.
1351 /// 2. An option is unstable, but was historically allowed on the stable
1353 /// 3. An option is unstable, and can only be used on nightly.
1355 /// Like unstable library and language features, however, unstable options have
1356 /// always required a form of "opt in" to indicate that you're using them. This
1357 /// provides the easy ability to scan a code base to check to see if anything
1358 /// unstable is being used. Currently, this "opt in" is the `-Z` "zed" flag.
1360 /// All options behind `-Z` are considered unstable by default. Other top-level
1361 /// options can also be considered unstable, and they were unlocked through the
1362 /// `-Z unstable-options` flag. Note that `-Z` remains to be the root of
1363 /// instability in both cases, though.
1365 /// So with all that in mind, the comments below have some more detail about the
1366 /// contortions done here to get things to work out correctly.
1367 pub fn handle_options(args: &[String]) -> Option<getopts::Matches> {
1368 // Throw away the first argument, the name of the binary
1369 let args = &args[1..];
1371 if args.is_empty() {
1372 // user did not write `-v` nor `-Z unstable-options`, so do not
1373 // include that extra information.
1374 usage(false, false);
1378 // Parse with *all* options defined in the compiler, we don't worry about
1379 // option stability here we just want to parse as much as possible.
1380 let mut options = getopts::Options::new();
1381 for option in config::rustc_optgroups() {
1382 (option.apply)(&mut options);
1384 let matches = options.parse(args).unwrap_or_else(|f|
1385 early_error(ErrorOutputType::default(), &f.to_string()));
1387 // For all options we just parsed, we check a few aspects:
1389 // * If the option is stable, we're all good
1390 // * If the option wasn't passed, we're all good
1391 // * If `-Z unstable-options` wasn't passed (and we're not a -Z option
1392 // ourselves), then we require the `-Z unstable-options` flag to unlock
1393 // this option that was passed.
1394 // * If we're a nightly compiler, then unstable options are now unlocked, so
1395 // we're good to go.
1396 // * Otherwise, if we're a truly unstable option then we generate an error
1397 // (unstable option being used on stable)
1398 // * If we're a historically stable-but-should-be-unstable option then we
1399 // emit a warning that we're going to turn this into an error soon.
1400 nightly_options::check_nightly_options(&matches, &config::rustc_optgroups());
1402 if matches.opt_present("h") || matches.opt_present("help") {
1403 // Only show unstable options in --help if we *really* accept unstable
1404 // options, which catches the case where we got `-Z unstable-options` on
1405 // the stable channel of Rust which was accidentally allowed
1407 usage(matches.opt_present("verbose"),
1408 nightly_options::is_unstable_enabled(&matches));
1412 // Handle the special case of -Wall.
1413 let wall = matches.opt_strs("W");
1414 if wall.iter().any(|x| *x == "all") {
1419 // Don't handle -W help here, because we might first load plugins.
1420 let r = matches.opt_strs("Z");
1421 if r.iter().any(|x| *x == "help") {
1422 describe_debug_flags();
1426 let cg_flags = matches.opt_strs("C");
1428 if cg_flags.iter().any(|x| *x == "help") {
1429 describe_codegen_flags();
1433 if cg_flags.iter().any(|x| *x == "no-stack-check") {
1434 early_warn(ErrorOutputType::default(),
1435 "the --no-stack-check flag is deprecated and does nothing");
1438 if cg_flags.iter().any(|x| *x == "passes=list") {
1439 get_codegen_sysroot("llvm")().print_passes();
1443 if matches.opt_present("version") {
1444 version("rustc", &matches);
1451 fn parse_crate_attrs<'a>(sess: &'a Session, input: &Input) -> PResult<'a, Vec<ast::Attribute>> {
1453 Input::File(ref ifile) => {
1454 parse::parse_crate_attrs_from_file(ifile, &sess.parse_sess)
1456 Input::Str { ref name, ref input } => {
1457 parse::parse_crate_attrs_from_source_str(name.clone(),
1464 // Temporarily have stack size set to 32MB to deal with various crates with long method
1465 // chains or deep syntax trees.
1466 // FIXME(oli-obk): get https://github.com/rust-lang/rust/pull/55617 the finish line
1467 const STACK_SIZE: usize = 32 * 1024 * 1024; // 32MB
1469 /// Runs `f` in a suitable thread for running `rustc`; returns a `Result` with either the return
1470 /// value of `f` or -- if a panic occurs -- the panic value.
1472 /// This version applies the given name to the thread. This is used by rustdoc to ensure consistent
1473 /// doctest output across platforms and executions.
1474 pub fn in_named_rustc_thread<F, R>(name: String, f: F) -> Result<R, Box<dyn Any + Send>>
1475 where F: FnOnce() -> R + Send + 'static,
1478 #[cfg(all(unix, not(target_os = "haiku")))]
1479 let spawn_thread = unsafe {
1480 // Fetch the current resource limits
1481 let mut rlim = libc::rlimit {
1485 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1486 let err = io::Error::last_os_error();
1487 error!("in_rustc_thread: error calling getrlimit: {}", err);
1489 } else if rlim.rlim_max < STACK_SIZE as libc::rlim_t {
1491 } else if rlim.rlim_cur < STACK_SIZE as libc::rlim_t {
1492 std::rt::deinit_stack_guard();
1493 rlim.rlim_cur = STACK_SIZE as libc::rlim_t;
1494 if libc::setrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1495 let err = io::Error::last_os_error();
1496 error!("in_rustc_thread: error calling setrlimit: {}", err);
1497 std::rt::update_stack_guard();
1500 std::rt::update_stack_guard();
1508 // We set the stack size at link time. See src/rustc/rustc.rs.
1510 let spawn_thread = false;
1512 #[cfg(target_os = "haiku")]
1513 let spawn_thread = unsafe {
1514 // Haiku does not have setrlimit implemented for the stack size.
1515 // By default it does have the 16 MB stack limit, but we check this in
1516 // case the minimum STACK_SIZE changes or Haiku's defaults change.
1517 let mut rlim = libc::rlimit {
1521 if libc::getrlimit(libc::RLIMIT_STACK, &mut rlim) != 0 {
1522 let err = io::Error::last_os_error();
1523 error!("in_rustc_thread: error calling getrlimit: {}", err);
1525 } else if rlim.rlim_cur >= STACK_SIZE {
1532 #[cfg(not(any(windows, unix)))]
1533 let spawn_thread = true;
1535 // The or condition is added from backward compatibility.
1536 if spawn_thread || env::var_os("RUST_MIN_STACK").is_some() {
1537 let mut cfg = thread::Builder::new().name(name);
1539 // FIXME: Hacks on hacks. If the env is trying to override the stack size
1540 // then *don't* set it explicitly.
1541 if env::var_os("RUST_MIN_STACK").is_none() {
1542 cfg = cfg.stack_size(STACK_SIZE);
1545 let thread = cfg.spawn(f);
1546 thread.unwrap().join()
1548 let f = panic::AssertUnwindSafe(f);
1549 panic::catch_unwind(f)
1553 /// Runs `f` in a suitable thread for running `rustc`; returns a
1554 /// `Result` with either the return value of `f` or -- if a panic
1555 /// occurs -- the panic value.
1556 pub fn in_rustc_thread<F, R>(f: F) -> Result<R, Box<dyn Any + Send>>
1557 where F: FnOnce() -> R + Send + 'static,
1560 in_named_rustc_thread("rustc".to_string(), f)
1563 /// Get a list of extra command-line flags provided by the user, as strings.
1565 /// This function is used during ICEs to show more information useful for
1566 /// debugging, since some ICEs only happens with non-default compiler flags
1567 /// (and the users don't always report them).
1568 fn extra_compiler_flags() -> Option<(Vec<String>, bool)> {
1569 let args = env::args_os().map(|arg| arg.to_string_lossy().to_string()).collect::<Vec<_>>();
1571 // Avoid printing help because of empty args. This can suggest the compiler
1572 // itself is not the program root (consider RLS).
1577 let matches = if let Some(matches) = handle_options(&args) {
1583 let mut result = Vec::new();
1584 let mut excluded_cargo_defaults = false;
1585 for flag in ICE_REPORT_COMPILER_FLAGS {
1586 let prefix = if flag.len() == 1 { "-" } else { "--" };
1588 for content in &matches.opt_strs(flag) {
1589 // Split always returns the first element
1590 let name = if let Some(first) = content.split('=').next() {
1596 let content = if ICE_REPORT_COMPILER_FLAGS_STRIP_VALUE.contains(&name) {
1602 if !ICE_REPORT_COMPILER_FLAGS_EXCLUDE.contains(&name) {
1603 result.push(format!("{}{} {}", prefix, flag, content));
1605 excluded_cargo_defaults = true;
1610 if !result.is_empty() {
1611 Some((result, excluded_cargo_defaults))
1618 pub struct CompilationFailure;
1620 impl Error for CompilationFailure {}
1622 impl Display for CompilationFailure {
1623 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
1624 write!(f, "compilation had errors")
1628 /// Run a procedure which will detect panics in the compiler and print nicer
1629 /// error messages rather than just failing the test.
1631 /// The diagnostic emitter yielded to the procedure should be used for reporting
1632 /// errors of the compiler.
1633 pub fn monitor<F: FnOnce() + Send + 'static>(f: F) -> Result<(), CompilationFailure> {
1634 in_rustc_thread(move || {
1636 }).map_err(|value| {
1637 if value.is::<errors::FatalErrorMarker>() {
1640 // Thread panicked without emitting a fatal diagnostic
1644 Box::new(errors::emitter::EmitterWriter::stderr(errors::ColorConfig::Auto,
1648 let handler = errors::Handler::with_emitter(true, false, emitter);
1650 // a .span_bug or .bug call has already printed what
1651 // it wants to print.
1652 if !value.is::<errors::ExplicitBug>() {
1653 handler.emit(&MultiSpan::new(),
1655 errors::Level::Bug);
1658 let mut xs: Vec<Cow<'static, str>> = vec![
1659 "the compiler unexpectedly panicked. this is a bug.".into(),
1660 format!("we would appreciate a bug report: {}", BUG_REPORT_URL).into(),
1661 format!("rustc {} running on {}",
1662 option_env!("CFG_VERSION").unwrap_or("unknown_version"),
1663 config::host_triple()).into(),
1666 if let Some((flags, excluded_cargo_defaults)) = extra_compiler_flags() {
1667 xs.push(format!("compiler flags: {}", flags.join(" ")).into());
1669 if excluded_cargo_defaults {
1670 xs.push("some of the compiler flags provided by cargo are hidden".into());
1675 handler.emit(&MultiSpan::new(),
1677 errors::Level::Note);
1680 panic::resume_unwind(Box::new(errors::FatalErrorMarker));
1685 pub fn diagnostics_registry() -> errors::registry::Registry {
1686 use errors::registry::Registry;
1688 let mut all_errors = Vec::new();
1689 all_errors.extend_from_slice(&rustc::DIAGNOSTICS);
1690 all_errors.extend_from_slice(&rustc_typeck::DIAGNOSTICS);
1691 all_errors.extend_from_slice(&rustc_resolve::DIAGNOSTICS);
1692 all_errors.extend_from_slice(&rustc_privacy::DIAGNOSTICS);
1693 // FIXME: need to figure out a way to get these back in here
1694 // all_errors.extend_from_slice(get_codegen_backend(sess).diagnostics());
1695 all_errors.extend_from_slice(&rustc_metadata::DIAGNOSTICS);
1696 all_errors.extend_from_slice(&rustc_passes::DIAGNOSTICS);
1697 all_errors.extend_from_slice(&rustc_plugin::DIAGNOSTICS);
1698 all_errors.extend_from_slice(&rustc_mir::DIAGNOSTICS);
1699 all_errors.extend_from_slice(&syntax::DIAGNOSTICS);
1701 Registry::new(&all_errors)
1704 /// This allows tools to enable rust logging without having to magically match rustc's
1705 /// log crate version
1706 pub fn init_rustc_env_logger() {
1711 init_rustc_env_logger();
1712 let result = run(|| {
1713 let args = env::args_os().enumerate()
1714 .map(|(i, arg)| arg.into_string().unwrap_or_else(|arg| {
1715 early_error(ErrorOutputType::default(),
1716 &format!("Argument {} is not valid Unicode: {:?}", i, arg))
1718 .collect::<Vec<_>>();
1720 Box::new(RustcDefaultCalls),
1724 process::exit(result as i32);